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Some Interesting Facts About the Moon. Let's Talk About The Dark Side!
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By NASA
Imagine designing technology that can survive on the Moon for up to a decade, providing a continuous energy supply. NASA selected three companies to develop such systems, aimed at providing a power source at the Moon’s South Pole for Artemis missions.
Three companies were awarded contracts in 2022 with plans to test their self-sustaining solar arrays at the Johnson Space Center’s Space Environment Simulation Laboratory (SESL) in Houston, specifically in Chamber A in building 32. The prototypes tested to date have undergone rigorous evaluations to ensure the technology can withstand the harsh lunar environment and deploy the solar array effectively on the lunar surface.
The Honeybee Robotics prototype during lunar VSAT (Vertical Solar Array Technology) testing inside Chamber A at NASA’s Johnson Space Center in Houston.NASA/David DeHoyos The Astrobotic Technology prototype during lunar VSAT testing inside Chamber A at Johnson Space Center. NASA/James Blair In the summer of 2024, both Honeybee Robotics, a Blue Origin company from Altadena, California and Astrobotic Technology from Pittsburgh, Pennsylvania put their solar array concepts to the test in Chamber A.
Each company has engineered a unique solution to design the arrays to withstand the harsh lunar environment and extreme temperature swings. The data collected in the SESL will support refinement of requirements and the designs for future technological advancements with the goal to deploy at least one of the systems near the Moon’s South Pole.
The contracts for this initiative are part of NASA’s VSAT (Vertical Solar Array Technology) project, aiming to support the agency’s long-term lunar surface operations. VSAT is under the Space Technology Mission Directorate Game Changing Development program and led by the Langley Research Center in Hampton, Virginia, in collaboration with Glenn Research Center in Cleveland.
“We foresee the Moon as a hub for manufacturing satellites and hardware, leveraging the energy required to launch from the lunar surface,” said Jim Burgess, VSAT lead systems engineer. “This vision could revolutionize space exploration and industry.”
Built in 1965, the SESL initially supported the Gemini and Apollo programs but was adapted to conduct testing for other missions like the Space Shuttle Program and Mars rovers, as well as validate the design of the James Webb Space Telescope. Today, it continues to evolve to support future Artemis exploration.
Johnson’s Front Door initiative aims to solve the challenges of space exploration by opening opportunities to the public and bringing together bold and innovative ideas to explore new destinations.
“The SESL is just one of the hundreds of unique capabilities that we have here at Johnson,” said Molly Bannon, Johnson’s Innovation and Strategy specialist. “The Front Door provides a clear understanding of all our capabilities and services, the ways in which our partners can access them, and how to contact us. We know that we can go further together with all our partners across the entire space ecosystem if we bring everyone together as the hub of human spaceflight.”
Chamber A remains as one of the largest thermal vacuum chambers of its kind, with the unique capability to provide extreme deep space temperature conditions down to as low as 20 Kelvin. This allows engineers to gather essential data on how technologies react to the Moon’s severe conditions, particularly during the frigid lunar night where the systems may need to survive for 96 hours in darkness.
“Testing these prototypes will help ensure more safe and reliable space mission technologies,” said Chuck Taylor, VSAT project manager. “The goal is to create a self-sustaining system that can support lunar exploration and beyond, making our presence on the Moon not just feasible but sustainable.”
The power generation systems must be self-aware to manage outages and ensure survival on the lunar surface. These systems will need to communicate with habitats and rovers and provide continuous power and recharging as needed. They must also deploy on a curved surface, extend 32 feet high to reach sunlight, and retract for possible relocation.
“Generating power on the Moon involves numerous lessons and constant learning,” said Taylor. “While this might seem like a technical challenge, it’s an exciting frontier that combines known technologies with innovative solutions to navigate lunar conditions and build a dynamic and robust energy network on the Moon.”
Watch the video below to explore the capabilities and scientific work enabled by the thermal testing conducted in Johnson’s Chamber A facility.
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By NASA
NASA NASA astronaut Alan Bean steps off the lunar module ladder in this photo from Nov. 19, 1969, joining astronaut Charles Conrad Jr. on the Moon in the area called the Ocean of Storms. The two would then complete two spacewalks on the lunar surface, deploying science instruments, collecting geology samples, and inspecting the Surveyor 3 spacecraft, which had landed in the same area. While Bean and Conrad worked on the Moon, astronaut Richard F. Gordon completed science from lunar orbit.
Learn more about Apollo 12’s pinpoint landing on the Moon.
Image credit: NASA
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By NASA
In November 1969, Apollo 12 astronauts Commander Charles “Pete” Conrad, Command Module Pilot (CMP) Richard F. Gordon, and Lunar Module Pilot (LMP) Alan L. Bean completed the second crewed lunar landing mission. Conrad and Bean achieved a pinpoint landing in the Ocean of Storms within walking distance of the Surveyor 3 spacecraft that landed there in April 1967. While Gordon conducted science from lunar orbit, Conrad and Bean completed two spacewalks on the lunar surface, deploying science instruments, collecting geology samples, and inspecting Surveyor including retrieving several of it parts for study back on Earth. Preparations continued for the next two missions, Apollo 13 and 14, tentatively planned for March and July 1970, respectively.
Apollo 12
Left: The crew of Apollo 12 – Charles “Pete” Conrad, left, Richard F. Gordon, and Alan L. Bean. Right: The Apollo 12 crew patch.
Left: The Apollo 12 crew of Charles “Pete” Conrad, center, Richard F. Gordon, and Alan L. Bean, facing them, at the traditional prelaunch breakfast, with their mascot “Irving” behind Conrad. Right: Conrad leads Gordon and Bean onto the astronaut van for the ride to Launch Pad 39A.
Left: Apollo 12, moments before liftoff into rainy skies. Middle: Liftoff of Apollo 12. Right: Lightning strikes Launch Pad 39A shortly after the Apollo 12 launch.
Lift off came precisely at 11:22 a.m. EST on Nov. 14, 1969, with the Saturn V launching Apollo 12 into a dark and rainy sky. The flight proceeded normally for the first 36 seconds, with Conrad even commenting that, “It’s a lovely liftoff. It’s not bad at all.” Then everything went haywire. With Apollo 12 at about 6,600 feet altitude and flying through clouds, observers on the ground noted lightning striking the launch pad. Onboard the spacecraft, the astronauts saw a bright flash, followed by many of the spacecraft’s electronics going offline, causing the three power-generating fuel cells to also go offline.
A second event 52 seconds into the flight caused the spacecraft guidance navigation system to go offline. In the Mission Control Center (MCC) at the Manned Spacecraft Center (MSC), now NASA’s Johnson Space Center in Houston, a young engineer named John W. Aaron monitored the spacecraft’s systems through the two incidents. He correctly deduced that the spacecraft’s Signal Conditioning Equipment (SCE) must have suffered some unknown upset and went offline. The simple solution to restoring it to normal function involved moving a seldom-used switch from its Normal to its Auxiliary position. Bean recalled the switch’s location on his panel, carried out the requested action, and restored the spacecraft’s systems. Aaron’s quick action saved the launch from two lightning strikes. Once Conrad understood the cause of the excitement, he radioed to Houston, “I think we need to do a little more all-weather testing.”
Left: View of the Earth shortly after Trans Lunar Injection, with one of the Spacecraft Lunar Module (LM) Adapter panels silhouetted against the clouds. Middle: During Transposition and Docking, the LM Intrepid still attached to the S-IVB third stage. Right: The receding Earth during the translunar coast.
The rest of the ascent continued without incident and Apollo 12 settled into orbit around the Earth. After verifying that all systems continued functioning properly following the lightning strikes, the astronauts received the call, “The good word is you’re Go for TLI,” the Trans Lunar Injection, the second burn of the third stage engine to send them on their way to the Moon. In his characteristic fashion, Conrad replied, “Hoop-ee-doo! We’re ready! We didn’t expect anything else!” The next major event, the Transposition and Docking (T&D) maneuver, began about 25 minutes later.
After the separation of the Command and Service Module (CSM) Yankee Clipper from the S-IVB stage, Gordon turned it around and slowly guided it to a docking with the LM Intrepid still attached to the top of the S-IVB. Conrad commented during the maneuver, “I got an awful pretty looking Intrepid sitting out the window here, gang. We’ll go get her.” After the docking, Gordon backed away from the third stage, extracting the LM in the process, and completing the T&D maneuver. For the next three days, the astronauts continued their journey toward the Moon. Along the way, they inspected Intrepid to verify it came to no harm from the lightning strikes, conducted one midcourse maneuver to ensure their accurate arrival near the Moon, and provided two TV broadcasts showing views of Earth and their spacecraft.
Left: Image from lunar orbit of the Fra Mauro highlands, the proposed landing site for Apollo 13 (inside white circle). Middle: The Lunar Module Intrepid as seen from the Command Module Yankee Clipper shortly after undocking. Right: Yankee Clipper as seen from Intrepid.
The Apollo 12 astronauts awoke for their fourth mission day to find themselves within the Moon’s gravitational sphere of influence. Apollo 12 sailed behind the Moon, losing contact with Earth. Thirteen minutes later, the astronauts fired the Service Propulsion System (SPS) engine for the Lunar Orbit Insertion burn, placing them into an elliptical orbit around the Moon.
Left: Still from 16 mm film looking out Alan L. Bean’s window at about 3,500 feet during the descent, showing the location of Surveyor Crater, the Apollo 12 landing site. Right: Illustration of the Apollo 12 landing site and the two surface traverses.
During the third lunar orbit, the crew fired the SPS engine again to circularize their orbit. The next day, Conrad and Bean donned their spacesuits and reactivated the LM for the separation and landing, extending Intrepid’s landing legs. After undocking and while behind the Moon, Conrad and Bean fired the LM’s Descent Propulsion System engine to lower Intrepid’s orbit. Exactly half a revolution later, Intrepid began the burn to drop it from orbit all the way to the landing in the Ocean of Storms. With Bean providing updates from the guidance computer, Conrad skillfully piloted Intrepid to a smooth landing just northwest of Surveyor Crater, and as they learned later, only 538 feet from Surveyor 3. Without much fanfare, Conrad and Bean completed the postlanding checklist, although Bean allowed himself a little exuberant “Good landing, Pete! Outstanding, man! Beautiful!” Conrad radioed to Mission Control, “Okay, we’re in hot shape, Houston. We’re in real good shape!” They had a chance to look out the windows, with Bean exclaiming, “Holy cran, it’s beautiful out here!” Conrad replied, “It sure is; it’s something else,” later adding, “Man! I can’t wait to get outside!”
Left: Charles “Pete” Conrad on the Lunar Module ladder about to descend to the surface. Middle: Alan L. Bean takes his first steps on the Moon. Right: Conrad working on the central station of the Apollo Lunar Surface Experiment Package, with its various instruments deployed around it.
Conrad and Bean donned their Portable Life Support System (PLSS) backpacks that provided oxygen and communications while on the surface and donned their helmets and gloves. They depressurized the LM, opened the hatch, and Conrad backed out onto the porch, slowly climbing down the ladder. Halfway down, he pulled a lanyard that deployed a color TV camera on the side of the LM’s descent stage, providing a view of him on the LM ladder. After he jumped from the bottom rung onto the footpad, Conrad exclaimed, “Whoopie! Man, that may have been a small one for Neil, but that’s a long one for me,” in reference to Armstrong’s famous words as he took humanity’s first step on the Moon and Conrad’s shorter stature. As he stepped off the pad, he remarked, “Oooh is that soft and queasy.” After taking a few tentative steps, Conrad informed everyone that he could see Surveyor 3 sitting inside the crater. He collected the contingency sample – in case they had to leave quickly due to an emergency, geologists would have one small sample from the Ocean of Storms.
Bean joined Conrad on the surface, both acclimating rapidly to working in one-sixth g. Conrad set up the S-band antenna for communications with Earth, but while setting up the TV camera, Bean accidentally pointed it at the Sun and damaged the vidicon tube, ending the live TV transmission from the Moon. Bean deployed the Solar Wind Collector (SWC), a Swiss experiment that collected particles from the solar wind, and then he and Conrad set up the American flag. They began the primary task of the first spacewalk – setting up the various instruments of the Apollo Lunar Surface Experiment Package (ALSEP). Conrad and Bean carried them to their deployment location about 430 feet to the northwest of Intrepid. They explored the area around the ALSEP site, visiting craters of interest and collecting rock and soil samples before heading back toward Intrepid. They remarked on several occasions how the lunar dust clung to their suits and equipment, and as Conrad quipped, “We’re going to be a couple of dirty boogers.” First Bean then Conrad climbed up the ladder and once inside Intrepid they closed the hatch and repressurized the cabin. Their first spacewalk lasted 3 hours and 56 minutes. They set up hammocks in Intrepid and went to sleep.
Left and middle: Charles “Pete” Conrad and Alan L. Bean with the Surveyor 3 spacecraft, with their Lunar Module (LM) Intrepid visible in the background. Right: View from inside the LM through Bean’s window following the second spacewalk.
After a short night’s rest, Conrad and Bean prepared for their second spacewalk. As before, first Conrad and then Bean descended the ladder to the surface. Conrad walked to the ALSEP to inspect one of the instruments, the seismometer they deployed during the first spacewalk picking up his footsteps. Both then headed west from Intrepid, where Conrad rolled two rocks down into a crater, the vibrations captured by the seismometer. They collected several documented samples, often preceded with expressions like “Oooooh!” and “That’s a beauty!” and dug a trench to expose subsurface material, collecting a sample from about eight inches deep.
They set off toward the main objective of this spacewalk – Surveyor 3, resting on the inner slope of 600-foot-wide Surveyor Crater. Entering the crater from the south rim, they walked counterclockwise while descending down the slope until they reached the robotic spacecraft. After taking “tourist” pictures with Surveyor, the two photographed the craft from all angles, noting that the trenches left by its scoop and the marks from its footpads when it bounced after landing looked as fresh as when Surveyor photographed them in 1967. Using cutters, Conrad removed the craft’s camera, scoop, and other parts for return to Earth, where engineers and scientists examined them for the effects of 31 months in the harsh lunar environment. The work at Surveyor completed, the two returned to Intrepid. Bean retrieved the SWC experiment, overcoming difficulties in rolling it back up. Compared with a short 77-minute exposure during Apollo 11, this SWC collected samples of the solar wind for nearly 19 hours. With everything packed up, Bean followed by Conrad headed up the ladder. After closing the hatch, they repressurized Intrepid, ending the 3-hour 49-minute excursion.
The Apollo 12 landing site photographed by the Lunar Reconnaissance Orbiter in 2011, the inset showing the Lunar Module Intrepid’s descent stage.
Left: A still from 16 mm film recorded aboard Yankee Clipper of Intrepid’s approach just prior to docking. Middle: The Moon shortly after Trans Earth Injection. Right: A receding Moon during the trans Earth coast.
After returning inside Intrepid, Conrad and Bean took photographs out the windows, showing the signs of their visit – numerous footprints, the American flag, the S-band antenna, and in the distance, the ALSEP station. As Gordon in Yankee Clipper flew overhead on his 30th lunar revolution, Intrepid’s Ascent Stage engine ignited, and Conrad and Bean lifted off from the Moon after 31 hours and 31 minutes on the surface. Conrad exclaimed, “Liftoff! And away we go!” with Bean adding, “Boy, did it fire!” Intrepid and Yankee Clipper executed a series of maneuvers that led to their docking about three and a half hours after liftoff from the Moon. Their independent flights had lasted 37 hours and 42 minutes. The three astronauts opened the hatches between the two spacecraft and began transfers from Intrepid into Yankee Clipper, including the lunar samples, cameras, and film. Gordon transferred some unneeded items to be jettisoned in Intrepid. The transfers completed, they closed the hatches between the spacecraft and jettisoned the LM. To calibrate the seismometer left on the Moon, controllers sent a command to Intrepid to fire its thrusters to drop it out of orbit and send it crashing onto the surface. The seismometer recorded signals for nearly one hour after the impact.
Left: Recording from the Apollo 12 seismometer of the intentional crash of Intrepid’s ascent stage. Right: LRO image of the impact area and debris field of Intrepid’s ascent stage, east of the Fra Mauro B crater.
The primary activity for their remaining time around the Moon consisted of photographing potential landing sites for future Apollo missions, such as the Fra Mauro highlands and the Descartes region. On their 45th revolution, they went around to the Moon’s back side for the last time and they fired the SPS for the Trans Earth Injection burn. Apollo 12 left lunar orbit after 3 days 17 hours and 2 minutes. Conrad radioed to Mission Control, “Hello, Houston. Apollo 12’s en route home.”
During the three-day return trip to Earth, the astronauts conducted a midcourse maneuver to refine their trajectory, answered questions from geologists and other scientists, and held a press conference at the end of which they held up a homemade sign to the camera that read, “Yankee Clipper sailed with Intrepid to the Sea of Storms, Moon, November 14, 1969,” signed by all three crew members. With the Sun and the Earth nearly aligned, the astronauts could only see a very thin crescent of their home planet, prompting Conrad to comment, “Houston, we just got our first glimpse of you this morning, and there’s not very much of you out there.”
Left: The Moon continues to shrink in size as Apollo 12 heads for home. Middle: The Earth appearing as a thin crescent. Right: The Apollo 12 astronauts observed a total solar eclipse as they passed into Earth’s shadow shortly before reentry.
Left: The Apollo 12 Command Module Yankee Clipper descends on its three main parachutes seconds before splashdown. Middle: A recovery helicopter hovers over Yankee Clipper in the Stable II, or apex down, position, seconds after splashdown. Right: Image taken by a recovery diver of the decontamination officer assisting Alan L. Bean out of Yankee Clipper, with Richard F. Gordon, left, and Charles “Pete” Conrad already aboard the life raft.
Shortly before reentry, orbital mechanics had a show in store for the astronauts – their trajectory passed through the Earth’s shadow, treating them to a total solar eclipse. Gordon radioed Mission Control, “We’re getting a spectacular view at eclipse,” and Bean added that it was a “fantastic sight.” The excitement of the eclipse over, the astronauts prepared the cabin for reentry. The CM separated from the Service Module and rotated to point its heatshield into the direction of flight. At 400,000 feet, Yankee Clipper now travelling at 24,625 miles per hour encountered the first tendrils of Earth’s atmosphere. About four minutes of radio blackout followed as ionized gases created by the heat of reentry surrounded the spacecraft. As Apollo 12 came out of the blackout, the prime recovery ship U.S.S. Hornet established radar contact with the spacecraft at a distance of 119 miles. At about 24,000 feet, the spacecraft jettisoned its apex cover, then deployed its two drogue parachutes to slow and stabilize the capsule. At 10,000 feet, the three main orange and white parachutes deployed, with Conrad reporting, “Three gorgeous beautiful chutes.” Precisely 244 hours and 36 minutes after lifting off from Florida, Apollo 12 splashed down in the Pacific Ocean less than four miles from Hornet, bringing the second lunar landing mission to a successful conclusion.
Left: Apollo 12 astronauts Richard F. Gordon, left, Alan L. Bean, and Charles “Pete” Conrad aboard the recovery helicopter. Middle: Conrad, front, Gordon, and Bean walk from the helicopter to the Mobile Quarantine Facility (MQF). Right: Admiral John S. McCain addresses the Apollo 12 astronauts in the MQF.
The capsule assumed the apex down Stable 2 position in the water, but in less than five minutes three self-inflating balloons righted the spacecraft into the Stable 1 upright orientation. Five minutes later, a helicopter dropped the first three recovery team swimmers into the water, tasked with securing a flotation collar and rafts to the spacecraft. Decontamination officer Ernest “Ernie” L. Jahncke next dropped into the water and once the crew opened the hatch, he handed them fresh flight suits and respirators. A few minutes later, the crew reopened the hatch, and first Conrad, then Gordon, and finally Bean climbed aboard a life raft where Jahncke used a disinfectant solution to decontaminate the astronauts and the spacecraft. The recovery helicopter lowered a Billy Pugh net to haul the astronauts up from the raft, first Gordon, then Bean, and finally Conrad. Aboard the helicopter, NASA flight surgeon Dr. Clarence A. Jernigan gave each astronaut a brief physical examination during the short flight back to Hornet, declaring all three healthy.
After it landed on Hornet’s deck, sailors lowered the helicopter to the hangar deck, where Conrad, Gordon, and Bean, followed by Dr. Jernigan, walked the few steps to the Mobile Quarantine Facility (MQF) where NASA engineer Brock R. “Randy” Stone awaited them. He sealed the door of the MQF exactly one hour after splashdown. The five men spent the next five days together in the MQF until they arrived at the Lunar Receiving Laboratory (LRL) at MSC. The astronauts took congratulatory phone calls from President Richard M. Nixon, who field-promoted all three from U.S. Navy Commanders to Captains, and from NASA Administrator Thomas O. Paine. After the astronauts talked briefly with their families, Commander-in-Chief of Pacific Naval Forces Admiral John S. McCain formally welcomed them back to Earth, followed by brief speeches by Rear Admiral Donald C. Davis, Commander of Recovery Forces, and Capt. Carl J. Seiberlich, Hornet’s skipper.
Left: Apollo 12 Command Module Yankee Clipper in the water with U.S.S. Hornet approaching as a rescue helicopter circles. Middle: Recovery team members lift Yankee Clipper out of the water. Right: Sailors haul Yankee Clipper aboard the Hornet.
Within an hour after the astronauts arrived on board Hornet, the recovery team hauled Yankee Clipper out of the water and towed it below to the hangar deck next to the MQF. As Hornet set sail for Pearl Harbor, arriving there four days later, workers attached a hermetically sealed plastic tunnel between the MQF and Yankee Clipper, allowing Stone to leave the MQF and open the hatch to the capsule without breaking the biological barrier. He retrieved the two rock boxes containing the lunar samples, the bags containing the Surveyor parts, film cassettes, and mission logs from the capsule. He brought them to the MQF where he sealed them in plastic bags and transferred them to the outside through a transfer lock that included a decontamination wash.
Outside the MQF, NASA engineers placed these items into transport containers and loaded them aboard two separate aircraft. The first aircraft carrying one rock box and a second package containing film departed Hornet within nine hours of the recovery, flying to Pago Pago, American Samoa. From there the two containers were placed aboard a cargo aircraft and flown directly to Ellington Air Force Base (AFB) near MSC in Houston, arriving there late in the afternoon of Nov. 25. A second aircraft departed Hornet 14 hours after the first and included the second rock box, additional film as well as the astronaut medical samples. It flew to Pago Pago where workers transferred the containers to another cargo plane that flew them to Houston. Less than 48 hours after splashdown, scientists in the LRL were examining the lunar samples and processing the film.
Left: Technicians carry the first box of Apollo 12 lunar samples from the cargo plane after its arrival at Ellington Air Force Base in Houston. Middle: Technicians log in the first set of Apollo 12 lunar samples and film at the Lunar Receiving Laboratory’s (LRL) loading dock. Right: A technician weighs the first Apollo 12 Sample Return Container in the LRL.
Left: Technicians place the first Apollo 12 Sample Return Container (SRC) inside a glovebox at the Lunar Receiving Laboratory. Middle: The first Apollo 12 SRC inside a glovebox. Right: Scientists get the first glimpse of the Moon rocks inside the first SRC.
Left: Apollo 12 astronauts Richard F. Gordon, second from left, Alan L. Bean and Charles “Pete” Conrad prepare their mission report inside the MQF. Middle: Workers at Pearl Harbor in Honolulu offload the Mobile Quarantine Facility (MQF) from Hornet with the Apollo 12 crew inside. Right: Workers at Ellington Air Force Base in Houston offload the MQF with the astronauts inside.
Meanwhile, in the Pacific Ocean, Hornet sailed for Pearl Harbor, Hawaii, with the astronauts inside the MQF to maintain the strict back-contamination protocols. They also celebrated Thanksgiving on Nov. 27. Dr. Jernigan conducted regular medical examinations of the astronauts, who showed no ill effects from their ten-day spaceflight or any signs of infection by any lunar microorganisms. The crew members availed themselves of one amenity aboard the MQF that was a novelty at the time – a microwave oven for meal preparation.
On Nov. 28, Hornet arrived at Pearl Harbor. Workers lifted the MQF with the astronauts inside onto a flat-bed trailer. After a brief welcoming ceremony including traditional Hawaiian flower leis, ukulele music, and hula dancers, they drove the MQF to nearby Hickam AFB, where Air Force personnel loaded it onto a cargo aircraft. After an eight-hour flight, the aircraft arrived at Ellington on the morning of Nov. 29, where the MQF was offloaded in front of a waiting crowd of well-wishers including MSC Director Robert R. Gilruth and Apollo 11 astronaut Neil A. Armstrong. The astronauts’ wives and children were on hand to welcome them home to Houston. Workers placed the MQF on a flat-bed truck and drove it to the LRL. Less than two hours after landing in Houston the astronauts arrived inside the Crew Reception Area (CRA) where they spent the next 11 days. During their time in quarantine, they completed many of the postflight debriefs and examined the lunar rocks as well as the parts of Surveyor 3 such as its camera that they returned from the Ocean of Storms.
Left: Robert R. Gilruth, director of the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, welcomes the Apollo 12 astronauts home. Middle: The Apollo 12 astronauts’ wives Barbara Gordon, left, Jane Conrad, and Sue Bean and their children welcome their husbands home. Right: Apollo 11 astronaut Neil A. Armstrong greets the Apollo 12 crew upon their return to Ellington.
Left: Workers drive the Apollo 12 astronauts inside the Mobile Quarantine Facility (MQF) from Ellington Air Force Base to the Manned Spacecraft Center (MSC), now NASA’s Johnson Space Center in Houston. Middle: The MQF approaches MSC. Right: The MQF docked the MSC’s Building 37, the Lunar Receiving Laboratory.
Left: Charles “Pete” Conrad examines some of the Moon rocks he and Alan L. Bean returned from the Moon. Middle: Conrad and Richard F. Gordon place the rocks samples back in the collection bags. Right: Conrad examines the camera from Surveyor 3 that he and Bean returned from the Moon.
Left: The Apollo 12 Command Module Yankee Clipper arrives at the Lunar Receiving Laboratory (LRL) at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston. Middle: Yankee Clipper temporarily parked outside the LRL before workers roll it inside. Right: In the LRL, Richard F. Gordon writes on Yankee Clipper that served as his home for 10 days.
After the astronauts departed Hornet in Pearl Harbor, workers lifted Yankee Clipper from the carrier’s flight deck to the dock and drove it to Hickam AFB where technicians safed the vehicle by draining its toxic fuels. To preserve back-contamination protocols, Yankee Clipper’s hatch remained sealed. On Dec. 1, workers loaded Yankee Clipper onto a cargo aircraft at Hickam AFB. It arrived at Ellington AFB the next day and workers trucked it to the LRL, then towed it inside the spacecraft room of the CRA. The Apollo 12 astronauts signed their names on the capsule below the same words they held up during their inflight news conference – “Yankee Clipper Sailed with Intrepid to The Ocean of Storms, Moon, November 14, 1969.”
Left: The Apollo 12 Command Module Yankee Clipper on display at the Virginia Air and Space Center in Hampton. Middle: A technician examines the Surveyor 3 camera returned by Apollo 12. Right: The Surveyor 3 camera on display at the Smithsonian Institution’s National Air and Space Museum in Washington, D.C.
Visitors to the Virginia Air and Space Center in Hampton can view the Apollo 12 CM Yankee Clipper on display. Surveyor’s camera is on display at the Smithsonian Institution’s National Air and Space Museum in Washington, D.C.
Apollo 13
Left: Apollo 13 astronaut James A. Lovell preparing to test his spacesuit in a vacuum chamber in the Space Environment Simulation Laboratory at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston. Middle: Workers at NASA’s Kennedy Space Center in Florida prepare the Apollo 13 Command and Service Module. Right: Lovell during the geology field trip to Kilbourne Hills, New Mexico.
The next Moon landing mission, Apollo 13, planned to launch on March 12, 1970, and visit the Fra Mauro highlands region of the Moon. With the mission’s increased emphasis on science, geology training for the Apollo 13 prime crew of Commander James A. Lovell, CMP Thomas K. “Ken” Mattingly, and LMP Fred W. Haise, and their backups John W. Young, Jack L. Swigert, and Charles M. Duke, took on greater importance. Lovell, Haise, Young, and Duke, accompanied by several geologists, traveled to Kilbourne Hole, New Mexico, for a one-day geology field trip on Nov. 11. The area’s volcanic origins served as appropriate training for their planned landing site, then believed to be a result of volcanic activity. The astronauts practiced deploying their ALSEP set of instruments, including during suited tests in a vacuum chamber in MSC’s Space Environment Simulation Laboratory. At KSC, workers in the Manned Spacecraft Operations Building (MSOB) continued preparing both the CSM and the LM for Apollo 13 prior to stacking with the Saturn V rocket in December.
Apollo 14
Left: The Apollo 14 Command and Service Modules arrive at NASA’s Kennedy Space Center (KSC) for preflight processing. Middle: The Apollo 14 Lunar Module (LM) descent stage arrives at KSC. Right: The Apollo 14 LM ascent stage arrives at KSC.
Spacecraft components for Apollo 14, then planned for launch around July 1970, arrived at KSC in November 1969. The CM and SM arrived on Nov. 19 and workers in the MSOB mated the two components five days later. The two stages of the LM arrived in the MSOB on Nov. 24.
With special thanks to Robert B. Fish for his expertise on U.S.S. Hornet recovery operations.
To be continued …
News from around the world in November 1969:
November 10 – Sesame Street premieres on PBS.
November 12 – Five Americans and one New Zealander became the first women to visit the South Pole.
November 15 – Wendy’s Hamburgers opens in Columbus, Ohio.
November 20 – Brazilian soccer star Pelé scores his 1,000th goal.
November 22 – Isolation of a single gene announced by scientists at Harvard University.
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By NASA
Skywatching Skywatching Home Eclipses What’s Up Explore the Night Sky Night Sky Network More Tips and Guides FAQ 24 Min Read The Next Full Moon Will Be the Last of Four Consecutive Supermoons
Guardians of Traffic statue in Cleveland, Ohio, in front of the supermoon that was visible on Sept. 17, 2024. On this day, the full moon was a partial lunar eclipse; a supermoon; and a harvest moon. Credits:
NASA/GRC/Sara Lowthian-Hanna The Next Full Moon is a Supermoon; the Beaver, Frost, Frosty, or Snow Moon; Kartik Purnima; Loy Krathong; the Bon Om Touk (”Boat Racing Festival”) Moon, the Tazaungdaing Festival Moon; and Ill Poya.
The next full Moon will be Friday afternoon, November 15, 2024, at 4:29 PM EST. This will be early Saturday morning from Kamchatka and Fiji Time eastwards to the International Date Line. The Pleiades star cluster will appear near the full Moon. The Moon will appear full for about 3 days around this time, from a few hours before sunrise on Thursday morning to a few hours before sunrise on Sunday morning.
This full Moon will be the last of four consecutive supermoons, slightly closer and brighter than the first of the four in mid-August.
The Maine Farmers’ Almanac began publishing Native American names for full Moons in the 1930s. Over time these names have become widely known and used. According to this almanac, as the full Moon in November this is the Beaver Moon, the Frost or Frosty Moon, or the Snow Moon. For the Beaver Moon, one interpretation is that mid-Fall was the time to set beaver traps before the swamps freeze to ensure a supply of warm winter furs. Another interpretation suggests that the name Beaver Moon came from how active the beavers are in this season as they prepare for winter. The Frost, Frosty, or Snow Moon names come from the frosts and early snows that begin this time of year, particularly in northeastern North America.
This is Kartik Purnima (the full Moon of the Hindu lunar month of Kartik) and is celebrated by Hindus, Jains, and Sikhs (each for different reasons).
In Thailand and nearby countries this full Moon is Loy Krathong, a festival that includes decorating baskets and floating them on a river.
In Cambodia this full Moon corresponds with the 3-day Bon Om Touk (“Boat Racing Festival”), the Cambodian Water Festival featuring dragon boat races.
In Myanmar this is the Tazaungdaing Festival, a festival that predates the introduction of Buddhism and includes the launching of hot air balloons (sometimes flaming or laden with fireworks).
In Sri Lanka this is Ill (or Il) Poya, commemorating the Buddha’s ordination of sixty disciples as the first Buddhist missionaries.
In many traditional Moon-based calendars the full Moons fall on or near the middle of each month. This full Moon is near the middle of the tenth month of the Chinese year of the Dragon, Marcheshvan in the Hebrew calendar, a name often shortened to Cheshvan or Heshvan, and Jumādā al-ʾŪlā, the fifth month of the Islamic year.
As usual, the wearing of suitably celebratory celestial attire is encouraged in honor of the full Moon. Get ready for winter, visit a local river (particularly if there are any festivals or boat races), but please don’t launch flaming hot air balloons filled with fireworks (some online videos make it quite clear why this is a bad idea), especially in areas subject to wildfires!
The next month or two should be a great time for Jupiter and Saturn watching. Both will continue to shift westward each night, gradually making them easier to see earlier in the evening sky.
Gordon Johnston
Retired NASA Program Executive
As for other celestial events between now and the full Moon after next (with specific times and angles based on the location of NASA Headquarters in Washington, DC):
As Autumn continues the daily periods of sunlight continue shortening.
On Friday, November 15, (the day of the full Moon), morning twilight will begin at 5:51 AM EST, sunrise will be at 6:51 AM, solar noon will be at 11:53 AM when the Sun will reach its maximum altitude of 32.4 degrees, sunset will be at 4:54 PM, and evening twilight will end at 5:55 PM.
Our 24-hour clock is based on the average length of the solar day. The day of the winter solstice is sometimes called the “shortest day of the year” (because it has the shortest period of sunlight). But it could also be called the “longest day of the year” because the longest solar day is on or just after the solstice. Because the solar days are longer, the earliest sunset of the year occurs before the solstice and the latest sunrise of the year (ignoring Daylight Savings Time) occurs after the solstice. For the Washington, DC area, the sunsets on Friday and Saturday, December 6 and 7, 2024, are tied for the earliest sunsets. On Friday, morning twilight will begin at 6:10 AM EST, sunrise will be at 7:13 AM, solar noon will be at 11:59 AM when the Sun will reach its maximum altitude of 28.5 degrees, sunset will be at 4:45:50 PM, and evening twilight will end at 5:49 PM. On Saturday, morning twilight will begin at 6:11 AM EST, sunrise will be at 7:14 AM, solar noon will actually be at noon (12:00 PM) when the Sun will reach its maximum altitude of 28.4 degrees, sunset will be at 4:45:50 PM, and evening twilight will end at 5:49 PM.
By Sunday, December 15, (the day of the full Moon after next), morning twilight will begin at 6:16 AM EST, sunrise will be at 7:20 AM, solar noon will be at 12:04 PM when the Sun will reach its maximum altitude of 27.8 degrees, sunset will be at 4:47 PM, and evening twilight will end at 5:51 PM.
The next month or two should be a great time for Jupiter and Saturn watching, especially with a backyard telescope. Saturn was at its closest and brightest on September 7 and is high in the southern sky as evening twilight ends. Jupiter will be shifting into the evening sky during this lunar cycle. On November 15 Jupiter will be rising about a half hour after evening twilight ends. Jupiter will be at its closest and brightest on December 7, rising around sunset and setting around sunrise. By the full Moon after next on December 15, Jupiter will be 19 degrees above the horizon as evening twilight ends. Both Jupiter and Saturn will continue to shift westward each night, gradually making them easier to see earlier in the evening sky (and friendlier for backyard stargazing, especially if you have young ones with earlier bedtimes). With clear skies and a telescope you should be able to see Jupiter’s four bright moons, Ganymede, Callisto, Europa, and Io, noticeably shifting positions in the course of an evening. For Saturn, you should be able to see Saturn’s rings and its bright moon Titan. The rings are appearing thinner and will be edge-on to the Earth in March 2025. We won’t get the “classic” view of Saturn showing off its rings until 2026.
Comets
Of the two comets described in my last Moon Missive, one remains visible through large binoculars or a telescope during this lunar cycle. The sungrazing Comet C/2024 S1 (ATLAS) disintegrated during its very close pass by the Sun and is no longer visible. Comet C/2023 A3 (Tsuchinshan-ATLAS) will be in the evening sky, fading from visual magnitude 8 to 10.3 as it moves away from the Earth and Sun.
In addition, comet 33P/LINEAR should be visible with large binoculars or a telescope in November and December, shining at about magnitude 10 around its perihelion on November 29 and closest approach to Earth on December 9. The next comet that we anticipate might be visible to the unaided eye is C/2024 G3 (ATLAS), which will reach its closest to the Sun and Earth in mid January 2025. It is another sungrazing comet that might put on a good show or might break apart and vanish.
Meteor Showers
Unfortunately, one of the three major meteor showers of the year, the Geminids (004 GEM), will peak the morning of December 14, with the light of the nearly full Moon interfering. According to the International Meteor Organization, observers south of about 30 degrees north might be able to see these meteors for an hour or so between moonset and the first light of dawn (although the radiant for this meteor shower is at 33 degrees north latitude, so observers too far south of the equator will also have limited visibility). In a good year, this shower can produce 150 visible meteors per hour under ideal conditions, but this will not be a good year. For the Washington, DC area the MeteorActive app predicts that at about 2 AM EST on the morning of December 14, under bright suburban sky conditions, the peak rate from the Geminids and all other background sources might reach 20 meteors per hour.
If the weather cooperates by being clear with no clouds or hazes and you do go looking for meteors, try to find a place as far as possible from light sources that has a clear view of a wide expanse of the sky. Give your eyes plenty of time to adapt to the dark. Your color vision (cone cells), concentrated in the center of your field of view, will adapt to darkness in about 10 minutes. Your more sensitive night vision rod cells will continue to improve for an hour or more (with most of the improvement in the first 35 to 45 minutes). The more sensitive your eyes are, the more chance you will have of seeing meteors. Since some meteors are faint, you will tend to see more meteors from the “corner of your eye.” Even a short exposure to light (from passing car headlights, etc.) will start the adaptation over again (so no turning on a light or your cell phone to check what time it is).
In addition, a number of relatively minor meteor showers will peak during this lunar cycle. The light of the waning Moon will interfere with the Leonids (013 LEO) on November 17, α-Monocerotids (246 AMO) on November 21, and November Orionids (250 NOO) on November 28. The Phoenicids (254 PHO), best seen from the Southern Hemisphere, may peak around December 1. Models predict low rates and faint meteors this year but not much is known about this meteor shower. Most years the rates are low, but as reported by the International Meteor Organization, significant activity was observed in 2014. Once, in 1956, the Phoenicids reached an estimated rate of 100 visible meteors per hour. Another Southern Hemisphere shower is the Puppid-Velids (301 PUP), expected to peak sometime around December 4 at about 10 meteors per hour (under ideal conditions). The Monocerotids (019 MON) and σ-Hydrids (016 HYD) are both expected to peak on December 9 at 3 meteors per hour and 7 meteors per hour, respectively. These rates are low enough that seeing them from our light-polluted urban areas will be unlikely.
Evening Sky Highlights
On the evening of Friday, November 15 (the evening of the full Moon), as twilight ends (at 5:55 PM EST), the rising Moon will be 14 degrees above the east-northeastern horizon with the Pleiades star cluster 5 degrees to the lower left. The brightest planet in the sky will be Venus at 12 degrees above the southwestern horizon. Next in brightness will be Mercury at less than a degree above the west-southwestern horizon. Saturn will be 38 degrees above the south-southeastern horizon. Comet C/2023 A3 (Tsuchinshan-ATLAS) will be 39 degrees above the west-southwestern horizon, with its current brightness curve predicting it will have faded to magnitude 8, too faint to see with the unaided eye. The bright star closest to overhead will be Deneb at 79 degrees above the northwestern horizon. Deneb (visual magnitude 1.3) is the 19th brightest star in our night sky and is the brightest star in the constellation Cygnus the swan. One of the three bright stars of the “Summer Triangle” (along with Vega and Altair). Deneb is about 20 times more massive than our Sun but has used up its hydrogen, becoming a blue-white supergiant about 200 times the diameter of the Sun. If Deneb were where our Sun is, it would extend to about the orbit of the Earth. Deneb is about 2,600 light years from us.
As this lunar cycle progresses, Saturn and the background of stars will appear to shift westward each evening (as the Earth moves around the Sun). Bright Venus will shift to the left and higher in the sky along the southwestern horizon. Mercury, shining brighter than Saturn, will initially shift left along the southwestern horizon until November 19, after which it will shift to the right. On November 22 Jupiter will join the planets Venus, Mercury and Saturn in the sky as twilight ends, shining brighter than Mercury. November 24 will be the last evening Mercury will be above the horizon as evening twilight ends, although it will remain visible in the glow of dusk for a few more evenings as it dims and shifts towards its passage between the Earth and the Sun on December 5. Jupiter will be at its closest and brightest for the year on December 7. The waxing Moon will pass by Venus on December 4, Saturn on December 7, and the Pleiades on December 13.
By the evening of Saturday, December 14 (the start of the night of the December 15 full Moon), as twilight ends (at 5:50 PM EST), the rising Moon will be 19 degrees above the east-northeastern horizon with bright planet Jupiter 6 degrees to the right and the bright star Aldebaran father to the right. The brightest planet visible will be Venus at 21 degrees above the southwestern horizon. Next in brightness will be Jupiter. Saturn will be 43 degrees above the southern horizon. The bright star closest to overhead will still be Deneb at 61 degrees above the west-northwestern horizon.
Morning Sky Highlights
On the morning of Friday, November 15 (the morning of the full Moon after next), as twilight begins (at 5:51 AM EST), the setting full Moon will be 7 degrees above the west-northwestern horizon. The brightest planet in the sky will be Jupiter at 35 degrees above the western horizon. Mars will be at 68 degrees above the southwestern horizon. Comet C/2024 S1 (ATLAS) will not be visible, even with a telescope, as it broke apart into pieces too small to see as it passed its closest to the Sun on October 28. The bright star appearing closest to overhead will be Pollux at 69 degrees above the west-southwestern horizon (higher than Mars by about a half degree). Pollux is the 17th brightest star in our night sky and the brighter of the twin stars in the constellation Gemini. It is an orange tinted star about 34 lightyears from Earth. Pollux is not quite twice the mass of our Sun but about 9 times the diameter and 33 times the brightness.
As this lunar cycle progresses, Jupiter, Mars, and the background of stars will appear to shift westward each evening, with Mars passing near the Beehive star cluster in early December. The waning Moon will pass by the Pleiades star cluster on November 16, Jupiter on November 17, Mars and Pollux on November 20, appear on the other side of Mars on November 21, Regulus on November 22 and 23, and Spica on November 27 (passing in front of Spica for parts of the USA and Canada). Jupiter will be at its closest and brightest on December 7, rising around sunset and setting around sunrise. December 12 will be the first morning Mercury will be above the east-southeastern horizon as morning twilight begins, though it will be visible in the glow of dawn for a few days before.
By the morning of Sunday, December 15 (the morning of the full Moon after next), as twilight begins (at 6:16 AM EST), the setting full Moon will be 15 degrees above the west-northwestern horizon. The brightest planet in the sky will be Jupiter, appearing below the Moon at 5 degrees above the horizon. Second in brightness will be Mars at 46 degrees above the western horizon, then Mercury at 4 degrees above the east-southeastern horizon. The bright star appearing closest to overhead will be Regulus at 55 degrees above the southwestern horizon, with Arcturus a close second at 52 degrees above the east-southeastern horizon. Regulus is the 21st brightest star in our night sky and the brightest star in the constellation Leo the lion. The Arabic name for Regulus translates as “the heart of the lion.” Although we see Regulus as a single star, it is actually four stars (two pairs of stars orbiting each other). Regulus is about 79 light years from us. Arcturus is the brightest star in the constellation Boötes the herdsman or plowman and the 4th brightest star in our night sky. It is 36.7 light years from us. While it has about the same mass as our Sun, it is about 2.6 billion years older and has used up its core hydrogen, becoming a red giant 25 times the size and 170 times the brightness of our Sun. One way to identify Arcturus in the night sky is to start at the Big Dipper, then follow the arc of the handle as it “arcs towards Arcturus.”
Detailed Daily Guide
Here for your reference is a day-by-day listing of celestial events between now and the full Moon on December 15, 2024. The times and angles are based on the location of NASA Headquarters in Washington, DC, and some of these details may differ for where you are (I use parentheses to indicate times specific to the DC area). If your latitude is significantly different than 39 degrees north (and especially for my Southern Hemisphere readers), I recommend using an astronomy app set for your location or a star-watching guide from a local observatory, news outlet, or astronomy club.
Thursday morning, November 14, at 6:18 EST, the Moon will be at perigee, its closest to the Earth for this orbit.
As mentioned above, the full Moon will be Friday afternoon, November 15, 2024, at 4:29 PM EST. This will be early Saturday morning from Kamchatka and Fiji Time eastwards to the International Date Line. It will be the last of four consecutive supermoons. The Pleiades star cluster will appear near the full Moon. The Moon will appear full for about 3 days around this time, from a few hours before sunrise Thursday morning to a few hours before sunrise Sunday morning.
Friday evening into Saturday morning, November 15 to 16, the Pleiades star cluster will appear near the full Moon. This may best be viewed with binoculars, as the brightness of the full Moon may make it hard to see the stars in this star cluster. As evening twilight ends (at 5:55 PM EST), the Pleiades will appear 5 degrees to the lower left of the full Moon. By the time the Moon reaches its highest for the night (Saturday morning at 12:07 AM), the Pleiades will be 2 degrees to the upper left. The Moon will pass in front of the Pleiades in the early morning hours. By the time morning twilight begins (at 5:52 AM) the Pleiades will be a degree to the lower right of the Moon.
Saturday, November 16, will be when the planet Mercury reaches its greatest angular separation from the Sun as seen from the Earth for this apparition (called greatest elongation). Because the angle between the line from the Sun to Mercury and the line of the horizon changes with the seasons, the date when Mercury and the Sun are farthest apart as seen from the Earth is not always the same as when Mercury appears highest above the southwestern horizon as evening twilight ends, which will occur three evenings later, on November 19.
Saturday night into Sunday morning, November 16 to 17, the planet Uranus will be at its closest and brightest for the year, called “opposition” because on Saturday night it will be opposite the Earth from the Sun. At opposition Uranus can be bright enough to see with the unaided eye (under very clear, dark sky conditions). From our light-polluted urban locations you will need binoculars or a telescope.
Also on Saturday night into Sunday morning, November 16 to 17, the planet Jupiter will appear near the full Moon. As Jupiter rises on the east-northeastern horizon (at 6:14 PM EST) it will be 10 degrees to the lower left of the Moon. The Moon will reach its highest for the night about 7 hours later (at 1:09 AM), with Jupiter 7.5 degrees to the lower left. By the time morning twilight begins (at 5:52 AM) Jupiter will be 6 degrees to the left of the Moon.
Tuesday night into Wednesday morning, November 19 to 20, the bright star Pollux and the bright planet Mars will appear near the waning gibbous Moon. As the Moon rises on the northeastern horizon (at 8:20 PM EST), Pollux will be 2.5 degrees to the upper left of the Moon. By the time the Moon reaches its highest in the sky (at 4:11 AM) Pollux will be 5 degrees to the upper right of the Moon, with Mars 7.5 degrees to the lower left of the Moon, such that these three appear aligned. By the time morning twilight begins (at 5:55 AM) Mars will be 7 degrees to the upper left and Pollux 5.5 degrees to the lower right.
Wednesday night into Thursday morning, November 20 to 21, the waning gibbous Moon will have shifted to the other side of Mars. As the Moon rises on the east-northeastern horizon (at 9:29 PM EST) Mars will be 4 degrees to the upper right of the Moon. By the time the Moon reaches its highest for the night (at 5:03 AM) Mars will be 7 degrees to the right of the Moon. Morning twilight will begin less than an hour later (at 5:56 AM) with Mars 7 degrees to the lower right of the Moon.
Friday evening, November 22, will be the first evening the bright planet Jupiter will be above the east-northeastern horizon as evening twilight ends (at 5:51 PM EST).
Also on Friday evening, the waning Moon will appear half-full as it reaches its last quarter at 8:28 PM EST (when we can’t see it).
Friday night into Saturday morning, November 22 to 23, the bright star Regulus will appear near the waning half-Moon. As Regulus rises on the east-northeastern horizon (at 11:29 PM EST) it will be 9 degrees below the Moon, with Mars farther to the upper right and Pollux beyond Mars. By the time the Moon reaches its highest for the night (at 5:49 AM) Regulus will be 7 degrees to the lower left, and morning twilight will begin 8 minutes later (at 5:57 AM).
Saturday night into Sunday morning, November 23 to 24, the waning crescent Moon will have shifted to the other side of Regulus. When the Moon rises on the east-northeastern horizon (at 11:38 PM EST) Regulus will be 4 degrees to the upper right of the Moon. The pair will separate as the night progresses. By the time morning twilight begins (at 5:58 AM) Regulus will be 6.5 degrees to the upper right of the Moon.
Sunday evening, November 24, will be the last evening the planet Mercury will be above the west-southwestern horizon as evening twilight ends, although it should remain visible in the glow of dusk before twilight ends for a few more evenings as it dims and shifts towards its passage between the Earth and the Sun on December 5.
Tuesday morning, November 26, at 6:57 AM EST, the Moon will be at apogee, its farthest from the Earth for this orbit.
On Wednesday morning, November 27, the bright star Spica will appear near the waning crescent Moon. As Spica rises on the east-southeastern horizon (at 3:41 AM EST) it will be a degree below the Moon. As morning progresses the Moon will shift towards Spica, and for much of the Eastern USA and Canada the Moon will block Spica from view. See http://www.lunar-occultations.com/iota/bstar/1127zc1925.htm for a map and information on the areas that will be able to see this eclipse. Times will vary by location, but for the Washington, DC area, Spica will vanish behind the illuminated limb of the Moon at 5:34 AM and the Moon will still be blocking Spica from sight as morning twilight begins at 6:02 AM.
Early Sunday morning, December 1, at 1:22 AM EST, will be the new Moon, when the Moon passes between the Earth and the Sun and will not be visible from the Earth.
The day of or the day after the New Moon marks the start of the new month for most moon-based calendars. The eleventh month of the Chinese year of the Dragon starts on Sunday, December 1. Sundown on Sunday, December 1, marks the start of Kislev in the Hebrew calendar. Hanukkah will begin towards the end of Kislev. In the Islamic calendar the months traditionally start with the first sighting of the waxing crescent Moon. Many Muslim communities now follow the Umm al-Qura Calendar of Saudi Arabia, which uses astronomical calculations to start months in a more predictable way. Using this calendar, sundown on Sunday, December 1, will probably mark the beginning of Jumādā ath-Thāniyah, also known as Jumādā al-ʾĀkhirah.
Wednesday evening, December 4, the bright planet Venus will appear 3 degrees to the upper right of the waxing crescent Moon. The Moon will be 15 degrees above the southwestern horizon as evening twilight ends (at 5:49 PM EST). The Moon will set 2 hours later (at 7:46 PM).
Thursday evening, December 5, the planet Mercury will be passing between the Earth and the Sun as seen from the Earth, called inferior conjunction. Planets that orbit inside of the orbit of Earth can have two types of conjunctions with the Sun, inferior (when passing between the Earth and the Sun) and superior (when passing on the far side of the Sun as seen from the Earth). Mercury will be shifting from the evening sky to the morning sky and will begin emerging from the glow of dawn on the eastern horizon in less than a week.
Saturday afternoon, December 7, the planet Jupiter will be at its closest and brightest for the year, called “opposition” because it will be opposite the Earth from the Sun, effectively a “full” Jupiter. Jupiter will be 12 degrees above the east-northeastern horizon as evening twilight ends (at 5:49 PM EST), will reach its highest in the sky right around midnight (11:59 PM), and will be 11 degrees above the west-northwestern horizon as morning twilight begins (Sunday morning at 6:11 AM). Only planets that orbit farther from the Sun than the Earth can be seen at opposition.
Saturday evening, December 7, the planet Saturn will appear to the upper left of the waxing crescent Moon. They will be 6 degrees apart as evening twilight ends (at 5:49 PM EST). Saturn will appear to shift clockwise and closer to the Moon, so that by the time the Moon sets 5.5 hours later (at 11:18 PM) Saturn will be 3.5 degrees above the Moon on the west-southwestern horizon. For a swath in the Pacific Ocean off the coast of Asia the Moon will actually block Saturn from view, see http://lunar-occultations.com/iota/planets/1208saturn.htm for a map and information on the locations that can see this eclipse.
Sunday morning, December 8, the Moon will appear half-full as it reaches its first quarter at 10:27 AM EST (when we can’t see it).
Thursday morning, December 12, will be the first morning the planet Mercury will be above the east-southeastern horizon as morning twilight begins (at 6:14 AM EST).
Thursday morning, December 12, at 8:18 AM EST, the Moon will be at perigee, its closest to the Earth for this orbit.
Friday evening into Saturday morning, December 13 to 14, the Pleiades star cluster will appear near the full Moon. This may best be viewed with binoculars, as the brightness of the full Moon may make it hard to see the stars in this star cluster. As evening twilight ends (at 5:50 PM EST), the Pleiades will appear 4 degrees to the upper right of the full Moon. By the time the Moon reaches its highest for the night (at 10:49 PM), the Pleiades will be 6 degrees to the right. By about 2 AM the Pleiades will be 8 degrees to the lower right of the Moon and they will continue to separate as the morning progresses.
As mentioned above, one of the three major meteor showers of the year, the Geminids (004 GEM), will peak Saturday morning, December 14. The light of the nearly full Moon will interfere. In a good year, this shower can produce 150 visible meteors per hour under ideal conditions, but this will not be a good year. For the Washington, DC area the MeteorActive app predicts that at about 2 AM EST on the morning of December 14, under bright suburban sky conditions, the peak rate from the Geminids and all other background sources might reach 20 meteors per hour. See the meteor summary above for suggestions for meteor viewing.
Saturday morning, December 14, the full Moon, the bright planet Jupiter, and the bright star Aldebaran will form a triangle. As Aldebaran sets on the west-northwestern horizon (at 6:10 AM EST) it will be 9 degrees to the lower left of the Moon with Jupiter 7 degrees to the upper left of the Moon. Morning twilight will begin 6 minutes later.
Saturday evening, December 15, the full Moon will have shifted to the other side of Jupiter. Jupiter will be 6 degrees to the right of the Moon as evening twilight ends (at 5:50 PM EST) and the pair will separate as the night progresses.
The full Moon after next will be Sunday morning, December 15, 2024, at 4:02 AM EST. This will be Saturday evening from Alaska Time westwards to the International Date Line. The Moon will appear full for about 3 days around this time, from Friday evening through Monday morning, making this a full Moon weekend.
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NASA-Funded Study Examines Tidal Effects on Planet and Moon Interiors
NASA-supported scientists have developed a new method to compute how tides affect the interiors of planets and moons. Importantly, the new study looks at the effects of body tides on objects that don’t have a perfectly spherical interior structure, which is an assumption of most previous models.
The puzzling, fascinating surface of Jupiter’s icy moon Europa looms large in this newly-reprocessed color view, made from images taken by NASA’s Galileo spacecraft in the late 1990s. This is the color view of Europa from Galileo that shows the largest portion of the moon’s surface at the highest resolution. NASA/JPL-Caltech/SETI Institute Body tides refer to the deformations experienced by celestial bodies when they gravitationally interact with other objects. Think of how the powerful gravity of Jupiter tugs on its moon Europa. Because Europa’s orbit isn’t circular, the crushing squeeze of Jupiter’s gravity on the moon varies as it travels along its orbit. When Europa is at its closest to Jupiter, the planet’s gravity is felt the most. The energy of this deformation is what heats up Europa’s interior, allowing an ocean of liquid water to exist beneath the moon’s icy surface.
“The same is true for Saturn’s moon Enceladus.” says co-author Alexander Berne of CalTech in Pasadena and an affiliate at NASA’s Jet Propulsion Laboratory in Southern California. “Enceladus has an ice shell that is expected to be much more non-spherically symmetric than that of Europa.”
The body tides experienced by celestial bodies can affect how the worlds evolve over time and, in cases like Europa and Enceladus, their potential habitability for life as we know it. The new study provides a means to more accurately estimate how tidal forces affect planetary interiors.
In this movie Europa is seen in a cutaway view through two cycles of its 3.5 day orbit about the giant planet Jupiter. Like Earth, Europa is thought to have an iron core, a rocky mantle and a surface ocean of salty water. Unlike on Earth, however, this ocean is deep enough to cover the whole moon, and being far from the sun, the ocean surface is globally frozen over. Europa’s orbit is eccentric, which means as it travels around Jupiter, large tides, raised by Jupiter, rise and fall. Jupiter’s position relative to Europa is also seen to librate, or wobble, with the same period. This tidal kneading causes frictional heating within Europa, much in the same way a paper clip bent back and forth can get hot to the touch, as illustrated by the red glow in the interior of Europa’s rocky mantle and in the lower, warmer part of its ice shell. This tidal heating is what keeps Europa’s ocean liquid and could prove critical to the survival of simple organisms within the ocean, if they exist. The giant planet Jupiter is now shown to be rotating from west to east, though more slowly than its actual rate. NASA/JPL-Caltech The paper also discusses how the results of the study could help scientists interpret observations made by missions to a variety of different worlds, ranging from Mercury to the Moon to the outer planets of our solar system.
The study, “A Spectral Method to Compute the Tides of Laterally Heterogeneous Bodies,” was published in The Planetary Science Journal.
For more information on NASA’s Astrobiology Program, visit:
https://science.nasa.gov/astrobiology
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Karen Fox / Molly Wasser
Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
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