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After 60 Years, Nuclear Power for Spaceflight is Still Tried and True
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By NASA
On March 24, 1975, the last in a long line of super successful Saturn rockets rolled out from the vehicle assembly building to Launch Pad 39B at NASA’s Kennedy Space Center in Florida. The Saturn IB rocket for the Apollo-Soyuz Test Project was the 19th in the Saturn class stacked in the assembly building, beginning in 1966 with the Saturn V 500F facilities checkout vehicle. Thirteen flight Saturn V rockets followed, 12 to launch Apollo spacecraft and one to place the Skylab space station into orbit. In addition, workers stacked four flight Saturn IB rockets, three to launch crews to Skylab and one for Apollo-Soyuz, plus another for the Skylab rescue vehicle that was not needed and never launched. Previously, workers stacked Saturn I and Saturn IB rockets on the pads at Launch Complexes 34 and 37. With the successful liftoff in July 1975, the Saturn family of rockets racked up a 100 percent success rate of 32 launches.
Workers lower the Apollo command and service modules onto the spacecraft adaptor.NASA Technicians in the assembly building replace the fins on the Saturn IB rocket’s first stage. NASA Workers in the assembly building prepare to lower the spacecraft onto its Saturn IB rocket.NASA Inspections of the Saturn IB rocket’s first stage fins revealed hairline cracks in several hold-down fittings and managers ordered the replacement of all eight fins. While the cracks would not affect the flight of the rocket they bore the weight of the rocket on the mobile launcher. Workers finished the fin replacement on March 16. Engineers in Kennedy’s spacecraft operations building prepared the Apollo spacecraft for its historic space mission. By early March, they had completed checkout and assembly of the spacecraft and transported it to the assembly building on March 17 to mount it atop the Saturn IB’s second stage. Five days later, they topped off the rocket with the launch escape system.
The final Saturn IB begins its rollout from the vehicle assembly building. NASA The Saturn IB passes by the Launch Control Center. NASA Apollo astronauts Thomas Stafford, left, Vance Brand, and Donald “Deke” Slayton pose in front of their Saturn IB during the rollout.NASA On March 23, workers edged the mobile transporter carrying the Saturn IB just outside the assembly building’s High Bay 1, where engineers installed an 80-foot tall lightning mast atop the launch tower. The next morning, the stack continued its rollout to Launch Pad 39B with the prime crew of Thomas Stafford, Vance Brand, and Donald “Deke” Slayton and support crew members Robert Crippen and Richard Truly on hand to observe. About 7,500 people, including guests, dependents of Kennedy employees and NASA Tours patrons, watched as the stack moved slowly out of the assembly building on its five-mile journey to the launch pad.
Mission Control in Houston during the joint simulation with Flight Director Donald Puddy in striped shirt and a view of Mission Control in Moscow on the large screen at left. NASA A group of Soviet flight controllers in a support room in Mission Control in Houston during the joint simulation. NASA On March 20, flight controllers and crews began a series of joint simulations for the joint mission scheduled for July 1975. For the six days of simulations, cosmonauts Aleksei Leonov and Valeri Kubasov and astronauts Stafford, Brand, and Slayton participated in the activity in spacecraft simulators in their respective countries, with both control centers in Houston and outside Moscow fully staffed as if for the actual mission. The exercises simulated various phases of the mission, including the respective launches, rendezvous and docking, crew transfers and joint operations, and undocking.
Astronauts Thomas Stafford, left, Vance Brand, and Donald “Deke” Slayton in a boilerplate Apollo command module preparing for the water egress training. NASA Stafford, left, Slayton, and Brand in the life raft during water egress training. NASA Astronauts Stafford, Brand and Slayton participated in a water egress training activity on March 8, completing the exercise in a water tank in Building 260 at NASA’s Johnson Space Center in Houston. The astronauts practiced egressing from their spacecraft onto a lift raft and being lifted up with the use of a Billy Pugh rescue net. They practiced wearing their flight coveralls as well as their spacesuits.
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By European Space Agency
The NASA/ESA/CSA James Webb Space Telescope has captured a beautiful juxtaposition of the nearby protostellar outflow known as Herbig-Haro 49/50 with a perfectly positioned, more distant spiral galaxy. Due to the close proximity of this Herbig-Haro object to Earth, this new composite infrared image of the outflow from a young star allows researchers to examine details on small spatial scales like never before. With Webb, we can better understand how the jet activity associated with the formation of young stars can affect the environment surrounding them.
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By NASA
Explore This SectionWebb NewsLatest News Latest Images Blog (offsite) Awards X (offsite – login reqd) Instagram (offsite – login reqd) Facebook (offsite- login reqd) Youtube (offsite) OverviewAbout Who is James Webb? Fact Sheet Impacts+Benefits FAQ ScienceOverview and Goals Early Universe Galaxies Over Time Star Lifecycle Other Worlds ObservatoryOverview Launch Deployment Orbit Mirrors Sunshield Instrument: NIRCam Instrument: MIRI Instrument: NIRSpec Instrument: FGS/NIRISS Optical Telescope Element Backplane Spacecraft Bus Instrument Module MultimediaAbout Webb Images Images Videos What is Webb Observing? 3d Webb in 3d Solar System Podcasts Webb Image Sonifications TeamInternational Team People Of Webb MoreFor the Media For Scientists For Educators For Fun/Learning 5 Min Read NASA’s Webb Telescope Unmasks True Nature of the Cosmic Tornado
NASA’s James Webb Space Telescope observed Herbig-Haro 49/50, an outflow from a nearby still-forming star, in high-resolution near- and mid-infrared light. Credits: NASA, ESA, CSA, STScI Craving an ice cream sundae with a cherry on top? This random alignment of Herbig-Haro 49/50 — a frothy-looking outflow from a nearby protostar — with a multi-hued spiral galaxy may do the trick. This new composite image combining observations from NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) and MIRI (Mid-Infrared Instrument) provides a high-resolution view to explore the exquisite details of this bubbling activity.
Herbig-Haro objects are outflows produced by jets launched from a nearby, forming star. The outflows, which can extend for light-years, plow into a denser region of material. This creates shock waves, heating the material to higher temperatures. The material then cools by emitting light at visible and infrared wavelengths.
Image A:
Herbig-Haro 49/50 (NIRCam and MIRI Image)
NASA’s James Webb Space Telescope observed Herbig-Haro 49/50, an outflow from a nearby still-forming star, in high-resolution near- and mid-infrared light. The intricate features of the outflow, represented in reddish-orange color, provide detailed clues about how young stars form and how their jet activity affects the environment around them. Like the wake of a speeding boat, the bow shocks in this image have an arc-like appearance as the fast-moving jet from the young star slams into the surrounding dust and gas. A chance alignment in this direction of the sky provides a beautiful juxtaposition of this nearby Herbig-Haro object with a more distant spiral galaxy in the background. Herbig-Haro 49/50 gives researchers insights into the early phases of the formation of low-mass stars similar to our own Sun. In this Webb image, blue represents light at 2.0-microns (F200W), cyan represents light at 3.3-microns (F335M), green is 4.4-microns (F444W), orange is 4.7-microns (F470N), and red is 7.7-microns (F770W).NASA, ESA, CSA, STScI When NASA’s retired Spitzer Space Telescope observed it in 2006, scientists nicknamed Herbig-Haro 49/50 (HH 49/50) the “Cosmic Tornado” for its helical appearance, but they were uncertain about the nature of the fuzzy object at the tip of the “tornado.” With its higher imaging resolution, Webb provides a different visual impression of HH 49/50 by revealing fine features of the shocked regions in the outflow, uncovering the fuzzy object to be a distant spiral galaxy, and displaying a sea of distant background galaxies.
Image B:
Herbig-Haro 49/50 (Spitzer and Webb Images Side-by-Side)
This side-by-side comparison shows a Spitzer Space Telescope Infrared Array Camera image of HH 49/50 (left) versus a Webb image of the same object (right) using the NIRCam (Near-infrared Camera) instrument and MIRI (Mid-infrared Instrument). The Webb image shows intricate details of the heated gas and dust as the protostellar jet slams into the material. Webb also resolves the “fuzzy” object located at the tip of the outflow into a distant spiral galaxy. The Spitzer image shows 3.6-micron light in blue, the 4.5-micron in green, and the 8.0-micron in red (IRAC1, IRAC2, IRAC4). In the Webb image, blue represents light at 2.0-microns (F200W), cyan represents light at 3.3-microns (F335M), green is 4.4-microns (F444W), orange is 4.7-microns (F470N), and red is 7.7-microns (F770W).NASA, ESA, CSA, STScI, NASA-JPL, SSC HH 49/50 is located in the Chamaeleon I Cloud complex , one of the nearest active star formation regions in our Milky Way, which is creating numerous low-mass stars similar to our Sun. This cloud complex is likely similar to the environment that our Sun formed in. Past observations of this region show that the HH 49/50 outflow is moving away from us at speeds of 60-190 miles per second (100-300 kilometers per second) and is just one feature of a larger outflow.
Webb’s NIRCam and MIRI observations of HH 49/50 trace the location of glowing hydrogen molecules, carbon monoxide molecules, and energized grains of dust, represented in orange and red, as the protostellar jet slams into the region. Webb’s observations probe details on small spatial scales that will help astronomers to model the properties of the jet and understand how it is affecting the surrounding material.
The arc-shaped features in HH 49/50, similar to a water wake created by a speeding boat, point back to the source of this outflow. Based on past observations, scientists suspect that a protostar known as Cederblad 110 IRS4 is a plausible driver of the jet activity. Located roughly 1.5 light-years away from HH 49/50 (off the lower right corner of the Webb image), CED 110 IRS4 is a Class I protostar. Class I protostars are young objects (tens of thousands to a million years old) in the prime time of gaining mass. They usually have a discernable disk of material surrounding them that is still falling onto the protostar. Scientists recently used Webb’s NIRCam and MIRI observations to study this protostar and obtain an inventory of the icy composition of its environment.
These detailed Webb images of the arcs in HH 49/50 can more precisely pinpoint the direction to the jet source, but not every arc points back in the same direction. For example, there is an unusual outcrop feature (at the top right of the main outflow) which could be another chance superposition of a different outflow, related to the slow precession of the intermittent jet source. Alternatively, this feature could be a result of the main outflow breaking apart.
The galaxy that appears by happenstance at the tip of HH 49/50 is a much more distant, face-on spiral galaxy. It has a prominent central bulge represented in blue that shows the location of older stars. The bulge also shows hints of “side lobes” suggesting that this could be a barred-spiral galaxy. Reddish clumps within the spiral arms show the locations of warm dust and groups of forming stars. The galaxy even displays evacuated bubbles in these dusty regions, similar to nearby galaxies observed by Webb as part of the PHANGS program.
Webb has captured these two unassociated objects in a lucky alignment. Over thousands of years, the edge of HH 49/50 will move outwards and eventually appear to cover up the distant galaxy.
Want more? Take a closer look at the image, “fly through” it in a visualization, and compare Webb’s image to the Spitzer Space Telescope’s.
Herbig-Haro 49/50 is located about 625 light-years from Earth in the constellation Chamaeleon.
The James Webb Space Telescope is the world’s premier space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and the Canadian Space Agency.
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Media Contacts
Laura Betz – laura.e.betz@nasa.gov
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Quyen Hart – qhart@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
Christine Pulliam – cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
Related Information
Images – Webb images of other protostar outflows – L483, HH 46/47, and HH 211
Animation Video – “Exploring Star and Planet Formation”
Interactive – Explore the jets emitted by young stars in multiple wavelengths: ViewSpace Interactive
Article – Read more about Herbig-Haro objects
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Last Updated Mar 23, 2025 EditorStephen SabiaContactLaura Betzlaura.e.betz@nasa.gov Related Terms
James Webb Space Telescope (JWST) Astrophysics Goddard Space Flight Center Science & Research Stars Stellar Evolution The Universe View the full article
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By NASA
On March 23, 1965, the United States launched the Gemini III spacecraft with astronauts Virgil “Gus” Grissom and John Young aboard, America’s first two-person spaceflight. Grissom earned the honor as the first person to enter space twice and Young as the first member of the second group of astronauts to fly in space. During their three-orbit flight they carried out the first orbital maneuvers of a crewed spacecraft, a critical step toward demonstrating rendezvous and docking. Grissom and Young brought Gemini 3 to a safe splashdown in the Atlantic Ocean. Their ground-breaking mission led the way to nine more successful Gemini missions in less than two years to demonstrate the techniques required for a Moon landing. Gemini 3 marked the last spaceflight controlled from Cape Kennedy, that function shifting permanently to a new facility in Houston.
In one of the first uses of the auditorium at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, managers announce the prime and backup Gemini III crews. NASA NASA astronauts Virgil “Gus” Grissom and John Young, the Gemini III prime crew. NASA Grissom, foreground, and Young in their capsule prior to launch.NASA On April 13, 1964, just five days after the uncrewed Gemini I mission, in the newly open auditorium at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, Director Robert Gilruth introduced the Gemini III crew to the press. NASA assigned Mercury 4 veteran Grissom and Group 2 astronaut Young as the prime crew, with Mercury 8 veteran Walter Schirra and Group 2 astronaut Thomas Stafford serving as their backups. The primary goals of Project Gemini included proving the techniques required for the Apollo Program to fulfil President John F. Kennedy’s goal of landing a man on the Moon and returning him safely to Earth before the end of the 1960s. Demonstrating rendezvous and docking between two spacecraft ranked as a high priority for Project Gemini.
Liftoff of Gemini III.NASA The uncrewed Gemini I and II missions validated the spacecraft’s design, reliability, and heat shield, clearing the way to launch Gemini III with a crew. On March 23, 1965, after donning their new Gemini spacesuits, Grissom and Young rode the transfer van to Launch Pad 19 at Cape Kennedy in Florida. They rode the elevator to their Gemini spacecraft atop its Titan II rocket where technicians assisted them in climbing into the capsule. At 9:24 a.m. EST, the Titan’s first stage engines ignited, and Gemini III rose from the launch pad.
The Mission Control Center at Cape Kennedy in Florida during Gemini III, controlling a human spaceflight for the final time.NASA The Mission Control Center at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, monitoring the Gemini III mission.NASA Five and a half minutes after launch, the Titan II’s second stage engine cut off and the spacecraft separated to begin its orbital journey. Grissom became the first human to enter space a second time. While engineers monitored the countdown from the Launch Pad 19 blockhouse, once in orbit flight controllers in the Mission Control Center at the Cape took over. Controllers in the new Mission Control Center at the Manned Spacecraft Center, now the Johnson Space Center in Houston, staffed consoles and monitored the mission in a backup capacity. Beginning with Gemini IV, control of all American human spaceflights shifted permanently to the Houston facility.
Gemini III entered an orbit of 100 miles by 139 miles above the Earth. Near the end of the first orbit, while passing over Texas, Grissom and Young fired their spacecraft’s thrusters for one minute, 14 seconds. “They appear to be firing good,” said Young, confirming the success of the maneuver. The change in velocity adjusted their orbit to 97 miles by 105 miles. A second burn 45 minutes later altered the orbital inclination by 0.02 degrees. Another task for the crew involved testing new food and packaging developed for Gemini. As an off-the-menu item, Young had stowed a corned beef on rye sandwich in his suit pocket before flight, and both he and Grissom took a bite before stowing it away, concerned about crumbs from the sandwich floating free in the cabin.
Shortly after splashdown, Gemini III astronaut Virgil “Gus” Grissom exits the spacecraft as crewmate John Young waits in the life raft. NASA Sailors hoist the Gemini III spacecraft aboard the prime recovery ship U.S.S. Intrepid.NASA Young, left, and Grissom stand with their spacecraft aboard Intrepid. NASA Near the end of their third revolution, Grissom and Young prepared for the retrofire burn to bring them out of orbit. They oriented Gemini III with its blunt end facing forward and completed a final orbital maneuver to lower the low point of their orbit to 45 miles, ensuring reentry even if the retrorockets failed to fire. They jettisoned the rearmost adapter section, exposing the retrorockets that fired successfully, bringing the spacecraft out of orbit. They jettisoned the retrograde section, exposing Gemini’s heat shield. Minutes later, they encountered the upper layers of Earth’s atmosphere at 400,000 feet, and he buildup of ionized gases caused a temporary loss of communication between the spacecraft and Mission Control. At 50,000 feet, Grissom deployed the drogue parachute to stabilize and slow the spacecraft, followed by the main parachute at 10,600 feet. Splashdown occurred in the Atlantic Ocean near Grand Turk Island, about 52 miles short of the planned point, after a flight of 4 hours, 52 minutes, 31 seconds.
Gemini III astronauts Virgil “Gus” Grissom, left, and John Young upon their return to Cape Kennedy in Florida. NASA Grissom and Young at the postflight press conference. NASA The welcome home ceremony for Grissom and Young at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston.NASA A helicopter recovered Grissom and Young and delivered them to the deck of the U.S.S. Intrepid, arriving there one hour and 12 minutes after splashdown. On board the carrier, the astronauts received a medical checkup and a telephone call from President Lyndon B. Johnson. The ship sailed to pick up the spacecraft and sailors hoisted it aboard less than three hours after landing. The day after splashdown, Grissom and Young flew to Cape Kennedy for debriefings, a continuation of the medical examinations begun on the carrier, and a press conference. Following visits to the White House, New York, and Chicago, the astronauts returned home to Houston on March 31. The next day, Gilruth welcomed them back to the Manned Spacecraft Center, where in front of the main administration building, workers raised an American flag that Grissom and Young had carried on their mission. That flag flew during every subsequent Gemini mission.
During the Gemini III welcome home ceremony in front of the main administration building at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, workers raise an American flag that the astronauts had carried on their mission. NASA
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By NASA
Explore This Section RPS Home About About RPS About the Program About Plutonium-238 Safety and Reliability For Mission Planners Contact RPS Systems Overview Power Systems Thermal Systems Dynamic Radioisotope Power Missions Overview Timeline News Resources STEM Power to Explore Contest FAQ 4 min read
NASA Reveals Semifinalists of Power to Explore Challenge
A word cloud showing “superpowers” of the 45 semifinalists. NASA/David Lam NASA selected 45 student essays as semifinalists of its 2024-2025 Power to Explore Challenge, a national competition for K-12 students featuring the enabling power of radioisotopes. Contestants were challenged to explore how NASA has powered some of its most famous science missions and to dream up how their personal “superpower” would energize their success on their own radioisotope-powered science mission to explore one of the nearly 300 moons of our solar system.
The competition asked students to learn about radioisotope power systems (RPS), a type of “nuclear battery” that NASA uses to explore the harshest, darkest, and dustiest parts of our solar system. RPS have enabled many spacecraft to explore a variety of these moons, some with active volcanoes, methane lakes, and intricate weather patterns similar to Earth. Many of these moons remain a mystery to us.
This year’s submissions to NASA’s Power to Explore Challenge were immensely enthralling, and we’re thrilled that the number of entries reached a record high.
Carl Sandifer II
Program Manager, NASA Radioisotope Power Systems Program
In 275 words or less, students wrote about a mission of their own that would use these space power systems to explore any moon in our solar system and described their own power to achieve their mission goals.
The Power to Explore Challenge offered students the opportunity to learn more about these reliable power systems, celebrate their own strengths, and interact with NASA’s diverse workforce. This year’s contest set a record, receiving 2,051 submitted entries from all 50 states, Guam, U.S. Virgin Islands, American Samoa, Northern Mariana Islands, Puerto Rico, and the Department of Defense Education Activity (DoDEA) Overseas.
“This year’s submissions to NASA’s Power to Explore Challenge were immensely enthralling, and we’re thrilled that the number of entries reached a record high,” said Carl Sandifer II, program manager of the Radioisotope Power Systems Program at NASA’s Glenn Research Center in Cleveland. “It was particularly interesting to see which moons the students selected for their individual essays, and the mysteries they hope to unravel. Their RPS-powered mission concepts always prove to be innovative, and it’s a joy to learn about their ‘superpowers’ that exemplify their path forward as the next generation of explorers.”
Entries were split into three categories: grades K-4, 5-8, and 9-12. Every student who submitted an entry received a digital certificate, and over 4,859 participants who signed up received an invitation to the Power Up with NASA virtual event. Students learned about what powers the NASA workforce utilizes to dream big and work together to explore. Speakers included Carl Sandifer II, Dr. Wanda Peters, NASA’s deputy associate administrator for programs in the Science Mission Directorate and Dr. Zibi Turtle, principal investigator for NASA’s Dragonfly mission from the John Hopkins Applied Physics Laboratory.
Fifteen national semifinalists in each grade category (45 semifinalists total) have been selected. These participants also will receive a NASA RPS prize pack. Finalists for this challenge will be announced on April 23.
Grades K-4
Vihaan Akhoury, Roseland, NJ Ada Brolan, Somerville, MA Ashwin Cohen, Washington D.C Unnathi Chandra Devavarapu, San Marcos, CA Levi Fisher, Portland, OR Tamanna Ghosh, Orlando, FL Ava Goodison, Arnold, MD Anika Lal, Pflugerville, TX Diya Loganathan, Secaucus, NJ Mini M, Ann Arbor, MI Mark Porter, Temple Hills, MD Rohith Thiruppathy, Canton, MI Zachary Tolchin, Guilford CT Kavin Vairavan, West Windsor Township, NJ Terry Xu, Arcadia, CA Grades 5-8
Chowdhury Wareesha Ali, Solon OH Caydin Brandes, Los Angeles, CA Caleb Braswell, Crestview, FL Lilah Coyan, Spokane, WA Ashwin Dhondi Kubeer, Phoenix, AZ Jonathan Gigi, Cypress, TX Gagan Girish, Portland, OR Maggie Hou, Snohomish, WA Sanjay Koripelli, Louisville, KY Isaiah Muniz, South Orange, NJ Sarabhesh Saravanakumar, Bothell, WA Eliya Schubert, Katonah, NY Gabriel Traska, Fort Woth, TX Jaxon Verbeck, Riggins, ID Krish Vinodhkumar, Monrovia, MD Grades 9-12
Samaria Berry, Kinder, LA David Cai, Saipan, MP Reggie Castro, Saipan, MP Ryan Danyow, Rutland City, VT Faiz Karim, Jericho, NY Sakethram Kuncha, Chantilly, VA Katerina Morin, Miami, FL Emilio Olivares, Edmond, OK Kairat Otorov, Trumbull, CT Dev Rai, Herndon, VA Shaurya Saxena, Irving, TX Saanvi Shah, Bothell, WA Niyant Sithamraju, San Ramon, CA Anna Swenson, Henderson, NV Alejandro Valdez, Orlando, FL About the Challenge
The Power to Explore Student Challenge is funded by the NASA Science Mission Directorate’s Radioisotope Power Systems Program Office and managed and administered by Future Engineers under the direction of the NASA Tournament Lab, a part of the Prizes, Challenges, and Crowdsourcing Program in NASA’s Space Technology Mission Directorate.
Kristin Jansen
NASA’s Glenn Research Center
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