Jump to content

30 Years Ago: STS-68 The Second Space Radar Lab Mission


Recommended Posts

  • Publishers
Posted

On Sept. 30, 1994, space shuttle Endeavour took to the skies on its 7th trip into space. During the 11-day mission, the STS-68 crew of Commander Michael A. Baker, Pilot Terrence “Terry” W. Wilcutt, and Mission Specialists Steven L. Smith, Daniel W. Bursch, Peter J.K. “Jeff” Wisoff, and Payload Commander Thomas “Tom” D. Jones operated the second Space Radar Laboratory (SRL-2) as part of NASA’s Mission to Planet Earth. Flying five months after SRL-1, results from the two missions provided unprecedented insight into Earth’s global environment across contrasting seasons. The astronauts observed pre-selected sites around the world as well as a volcano that erupted during their mission using SRL-2’s U.S., German, and Italian radar instruments and handheld cameras.

The STS-68 crew patch Official photo of the STS-68 crew of Thomas D. Jones, front row left, Peter J.K. “Jeff” Wisoff, Steven L. Smith, and Daniel W. Bursch; Michael A. Baker, back row left, and Terrence W. Wilcutt
Left: The STS-68 crew patch. Right: Official photo of the STS-68 crew of Thomas D. Jones, front row left, Peter J.K. “Jeff” Wisoff, Steven L. Smith, and Daniel W. Bursch; Michael A. Baker, back row left, and Terrence W. Wilcutt.

In August 1993, NASA named Jones as the SRL-2 payload commander, eight months before he flew as a mission specialist on STS-59, the SRL-1 mission. When NASA could not meet JPL’s request to fly their personnel as payload specialists on the SRL missions, the compromise solution reached had one NASA astronaut – in this case, Jones – fly on both missions. Selected as an astronaut in 1990, STS-59 marked Jones’ first flight and STS-68 his second. In October 1993, NASA named the rest of the STS-68 crew. For Baker, selected in 1985, SRL-2 marked his third trip into space, having flown on STS-43 and STS-52. Along with Jones, Wilcutt, Bursch, and Wisoff all came from the class of 1990, nicknamed The Hairballs. STS-68 marked Wilcutt’s first spaceflight, while Bursch had flown once before on STS-51 and Wisoff on STS-57. Smith has the distinction as the first from his class of 1992 – The Hogs – assigned to a spaceflight, but the Aug. 18 launch abort robbed him of the distinction of the first to actually fly, the honor going instead to Jerry M. Linenger when STS-64 ended up flying before STS-68.

The Spaceborne Imaging Radar-C (SIR-C) in Endeavour’s payload bay in the Orbiter Processing Facility at NASA’s Kennedy Space Center in Florida Endeavour on Launch Pad 39A STS-68 crew in the Astrovan on its way to Launch Pad 39A for the Terminal Countdown Demonstration Test
Left: The Spaceborne Imaging Radar-C (SIR-C) in Endeavour’s payload bay in the Orbiter Processing Facility at NASA’s Kennedy Space Center in Florida. Middle: Endeavour on Launch Pad 39A. Right: STS-68 crew in the Astrovan on its way to Launch Pad 39A for the Terminal Countdown Demonstration Test.

The SRL payloads consisted of three major components – the Spaceborne Imaging Radar-C (SIR-C), built by NASA’s Jet Propulsion Laboratory in Pasadena, California, the X-band Synthetic Aperture Radar (X-SAR) sponsored by the German Space Agency DLR and the Italian Space Agency ASI, and the Measurement of Air Pollution from Satellites (MAPS), built by NASA’s Langley Research Center in Hampton, Virginia. Scientists from 13 countries participated in the SRL data gathering program, providing ground truth at preselected observation sites. The SIR system first flew as SIR-A on STS-2 in November 1981, although the shortened mission limited data gathering. It flew again as SIR-B on STS-41G in October 1984, and gathering much useful data.

Building on that success, NASA planned to fly an SRL mission on STS-72A, launching in March 1987 into a near-polar orbit from Vandenberg Air Force, now Space Force, Base in California, but the Challenger accident canceled those plans. With polar orbits no longer attainable, a 57-degree inclination remained the highest achievable from NASA’s Kennedy Space Center (KSC) in Florida, still allowing the radar to study more than 75% of Earth’s landmasses. As originally envisioned, SRL-2 would fly about six months after the first mission, allowing data gathering during contrasting seasons. Shuttle schedules moved the date of the second mission up to August 1994, only four months after the first. But events intervened to partially mitigate that disruption.

Launch abort at Launch Pad 39A at NASA’s Kennedy Space Center in Florida space shuttle Discovery arrives at Launch Pad 39B, left, with space shuttle Endeavour still on Launch Pad 39A, awaiting its rollback to the Vehicle Assembly Building
Left: Launch abort at Launch Pad 39A at NASA’s Kennedy Space Center in Florida. Right: A few days after the launch abort, space shuttle Discovery arrives at Launch Pad 39B, left, with space shuttle Endeavour still on Launch Pad 39A, awaiting its rollback to the Vehicle Assembly Building.

Endeavour arrived back at KSC following its previous flight, the STS-59 SRL-1 mission, in May 1994. Workers in KSC’s Orbiter Processing Facility refurbished the SRL-1 payloads for their reflight and serviced the orbiter, rolling it over to the Vehicle Assembly Building (VAB) on July 21 for mating with its External Tank and Solid Rocket Boosters (SRBs). Endeavour rolled out to Launch Pad 39A on July 27. The six-person STS-68 crew traveled to KSC to participate in the Terminal Countdown Demonstration Test on Aug. 1, essentially a dress rehearsal for the launch countdown. They returned to KSC on Aug. 15, the same day the final countdown began.

Following a smooth countdown leading to a planned 5:54 a.m. EDT launch on Aug. 18, Endeavour’s three main engines came to life 6.6 seconds before liftoff. With just 1.8 seconds until the two SRBs ignited to lift the shuttle stack off the pad, the Redundant Set Launch Sequencer (RSLS) stopped the countdown and shutdown the three main engines, two of which continued running past the T-zero mark. It marked the fifth and final launch abort of the shuttle program, and the closest one to liftoff. Bursch now had the distinction as the only person to have experienced two RSLS launch aborts, his first one occurring on STS-51 just a year earlier. Engineers traced the shutdown to higher than anticipated temperatures in a high-pressure oxygen turbopump in engine number three. The abort necessitated a rollback of Endeavour to the VAB on Aug. 24 to replace all three main engines with three engines from Atlantis on its upcoming STS-66 mission. Engineers shipped the suspect engine to NASA’s Stennis Space Center in Mississippi for extensive testing, where it worked fine and flew on STS-70 in July 1995. Meanwhile, Endeavour returned to Launch Pad 39A on Sept. 13.

Liftoff of Endeavour on the STS-68 mission
Liftoff of Endeavour on the STS-68 mission.

On Sept. 30, 1994, Endeavour lifted off on time at 6:16 a.m. EDT, and eight and half minutes later delivered its crew and payloads to space. Thirty minutes later, a firing of the shuttle’s Orbiter Maneuvering System (OMS) engines placed them in a 132-mile orbit inclined 57 degrees to the equator. The astronauts opened the payload bay doors, deploying the shuttle’s radiators, and removed their bulky launch and entry suits, stowing them for the remainder of the flight.

The Space Radar Laboratory-2 payload in Endeavour’s cargo bay, showing SIR-C (with the JPL logo on it), X-SAR (the long bar atop SIR-C), and MAPS (with the LaRC logo on it) The STS-68 Blue Team of Daniel W. Bursch, top, Steven L. Smith, and Thomas D. Jones in their sleep bunks Tile damage on Endeavour’s starboard Orbital Maneuvering System pod caused by a strike from a tile from Endeavour’s front window rim that came loose during the ascent
Left: The Space Radar Laboratory-2 payload in Endeavour’s cargo bay, showing SIR-C (with the JPL logo on it), X-SAR (the long bar atop SIR-C), and MAPS (with the LaRC logo on it). Middle: The STS-68 Blue Team of Daniel W. Bursch, top, Steven L. Smith, and Thomas D. Jones in their sleep bunks. Right: Tile damage on Endeavour’s starboard Orbital Maneuvering System pod caused by a strike from a tile from Endeavour’s front window rim that came loose during the ascent.

Steven L. Smith, left, and Peter J.K. “Jeff” Wisoff set up the bicycle ergometer in the shuttle’s middeck The STS-68 Red Team of Terrence W. Wilcutt, top, Wisoff, and Michael A. Baker in their sleep bunks Wilcutt consults the flight plan for the next maneuver
Left: Steven L. Smith, left, and Peter J.K. “Jeff” Wisoff set up the bicycle ergometer in the shuttle’s middeck. Middle: The STS-68 Red Team of Terrence W. Wilcutt, top, Wisoff, and Michael A. Baker in their sleep bunks. Right: Wilcutt consults the flight plan for the next maneuver.

The astronauts began to convert their vehicle into a science platform, and that included breaking up into two teams to enable 24-hour-a-day operations. Baker, Wilcutt, and Wisoff made up the Red Team while Smith, Bursch, and Jones made up the Blue Team. Within five hours of liftoff, the Blue Team began their sleep period while the Red Team started their first on orbit shift by activating the SIR-C and X-SAR instruments in the payload bay and some of the middeck experiments. During inspection of the OMS pods, the astronauts noted an area of damaged tile, later attributed to an impact from a tile from the rim of Endeavour’s front window that came loose during the ascent to orbit. Engineers on the ground assessed the damage and deemed it of no concern for the shuttle’s entry.

Michael A. Baker prepares to take photographs through the commander’s window Thomas D. Jones, left, Daniel W. Bursch, and Baker hold various cameras in Endeavour’s flight deck Terrence W. Wilcutt with four cameras
Left: Michael A. Baker prepares to take photographs through the commander’s window. Middle: Thomas D. Jones, left, Daniel W. Bursch, and Baker hold various cameras in Endeavour’s flight deck. Right: Terrence W. Wilcutt with four cameras.

Thomas D. Jones, left, and Daniel W. Bursch consult a map in an atlas developed specifically for the SRL-2 mission Jones takes photographs through the overhead window Steven L. Smith takes photographs through the overhead window
Left: Thomas D. Jones, left, and Daniel W. Bursch consult a map in an atlas developed specifically for the SRL-2 mission. Middle: Jones takes photographs through the overhead window. Right: Steven L. Smith takes photographs through the overhead window.

By sheer coincidence, the Klyuchevskaya volcano on Russia’s Kamchatka Peninsula began erupting on the day STS-68 launched. By the mission’s second day, the astronauts trained not only their cameras on the plume of ash reaching 50,000 feet high and streaming out over the Pacific Ocean but also the radar instruments. This provided unprecedented information of this amazing geologic event to scientists who could also compare these images with those collected during SRL-1 five months earlier.

Eruption of Klyuchevskaya volcano on Russia’s Kamchatka Peninsula Radar image of Klyuchevskaya volcano Comparison of radar images of Mt. Pinatubo in The Philippines taken during SRL-1 in April 1994 and SRL-2 in October 1994
Left: Eruption of Klyuchevskaya volcano on Russia’s Kamchatka Peninsula. Middle: Radar image of Klyuchevskaya volcano. Right: Comparison of radar images of Mt. Pinatubo in The Philippines taken during SRL-1 in April 1994 and SRL-2 in October 1994.

The STS-68 crew continued their Earth observations for the remainder of the 11-day flight, having received a one-day extension from Mission Control. On the mission’s eighth day, they lowered Endeavour’s orbit to 124 miles to begin a series of interferometry studies that called for extremely precise orbital maneuvering to within 30 feet of the orbits flown during SRL-1, the most precise in shuttle history to that time. These near-perfectly repeating orbits allowed the construction of three-dimensional contour images of selected sites. The astronauts repaired a failed payload high rate recorder and continued working on middeck and biomedical experiments.

Steven L. Smith, left, conducts a biomedical experiment as Michael A. Baker monitors Peter J.K. “Jeff” Wisoff, left, and Smith repair a payload high rate recorder
Left: Steven L. Smith, left, conducts a biomedical experiment as Michael A. Baker monitors. Right: Peter J.K. “Jeff” Wisoff, left, and Smith repair a payload high rate recorder.

The San Francisco Bay area The Niagara Falls and Buffalo area Riyadh, Saudi Arabia view of the Klyuchevskaya volcano on Russia’s Kamchatka Peninsula
A selection of STS-68 crew Earth observation photographs. Left: The San Francisco Bay area. Middle left: The Niagara Falls and Buffalo area. Middle right: Riyadh, Saudi Arabia. Right: Another view of the Klyuchevskaya volcano on Russia’s Kamchatka Peninsula.

view of the southern lights view of the aurora australis
The high inclination orbit afforded the astronauts great views of the aurora australis, or southern lights.

On this mission in particular, the STS-68 astronauts spent considerable time looking out the window, their images complementing the data taken by the radar instruments. Their high inclination orbit enabled views of parts of the planet not seen during typical shuttle missions, including spectacular views of the southern lights, or aurora australis.

STS-68 crew photo STS-68 crew photo
Two versions of the inflight STS-68 crew photo.

On flight day 11, with most of the onboard film exposed and consumables running low, the astronauts prepared for their return to Earth the following day. Baker and Wilcutt tested Endeavour’s reaction control system thrusters and aerodynamic surfaces in preparation for deorbit and descent through the atmosphere, while the rest of the crew busied themselves with shutting down experiments and stowing away unneeded equipment.

Endeavour moments before touchdown at California’s Edwards Air Force Base Michael A. Baker brings Endeavour home to close out STS-68 and a successful SRL-2 mission Baker gets a congratulatory tap on the shoulder from Terrence W. Wilcutt following wheels stop
Left: Endeavour moments before touchdown at California’s Edwards Air Force Base. Middle: Michael A. Baker brings Endeavour home to close out STS-68 and a successful SRL-2 mission. Right: Baker gets a congratulatory tap on the shoulder from Terrence W. Wilcutt following wheels stop.

As workers process Endeavour on the runway, Columbia atop a Shuttle Carrier Aircraft (SCA) flies overhead on its way to the Palmdale facility for refurbishment Mounted atop an SCA, Endeavour departs Edwards for the cross-country trip to NASA’s Kennedy Space Center in Florida
Left: As workers process Endeavour on the runway, Columbia atop a Shuttle Carrier Aircraft (SCA) flies overhead on its way to the Palmdale facility for refurbishment. Right: Mounted atop an SCA, Endeavour departs Edwards for the cross-country trip to NASA’s Kennedy Space Center in Florida.

On Oct. 11, the astronauts closed Endeavour’s payload bay doors, donned their launch and entry suits, and strapped themselves into their seats for entry and landing. Thick cloud cover at the KSC primary landing site forced first a two-orbit delay in their landing, then an eventual diversion to Edwards Air Force Base (AFB) in California. The crew fired Endeavour’s OMS engines to drop out of orbit. Baker piloted Endeavour to a smooth landing at Edwards, ending the 11-day 5-hour 46-minute flight. The crew had orbited the Earth 182 times. Workers at Edwards safed the vehicle and placed it atop a Shuttle Carrier Aircraft for the ferry flight back to KSC. The duo left Edwards on Oct. 19, and after stops at Biggs Army Airfield in El Paso, Texas, Dyess AFB in Abilene, Texas, and Eglin AFB in the Florida panhandle, arrived at KSC the next day. Workers there began preparing Endeavour for its next flight, STS-67, in March 1995. Meanwhile, a Gulfstream jet flew the astronauts back to Ellington Field in Houston for reunions with their families.

Diane Evans, SIR-C project scientist, summarized the scientific return from STS-68, “We’ve had a phenomenally successful mission.” The radar instrument collected 60 terabits of data, filling 67 miles of magnetic tape during the mission. In 1990s technology, that equated to a pile of floppy disks 15 miles high! In 2006, using an updated comparison, astronaut Jones equated that to a stack of CDs 65 feet high. The radar instruments completed 910 data takes of 572 targets during about 80 hours of imaging. To complement the radar data, the astronauts took nearly 14,000 photographs using 14 different cameras. To image the various targets required more than 400 maneuvers of the shuttle, requiring 22,000 keystrokes in the orbiter’s computer. The use of interferometry, requiring precision orbital tracking of the shuttle, to create three-dimensional topographic maps, marks another significant accomplishment of the mission. Scientists published more than 5,000 papers using data from the SRL missions.

Enjoy the crew narrate a video about the STS-68 mission. Read Wilcutt’s recollections of the mission in his oral history with the JSC History Office.

View the full article

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Similar Topics

    • By NASA
      4 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      A crane lowers the steel reflector framework for Deep Space Station 23 into position Dec. 18 on a 65-foot-high (20-meter) platform above the antenna’s pedestal that will steer the reflector. Panels will be affixed to the structure create a curved surface to collect radio frequency signals.NASA/JPL-Caltech After the steel framework of the Deep Space Station 23 reflector dish was lowered into place on Dec. 18, a crew installed the quadripod, a four-legged support structure that will direct radio frequency signals from deep space that bounce off the main reflector into the antenna’s receiver.NASA/JPL-Caltech Deep Space Station 23’s 133-ton reflector dish was recently installed, marking a key step in strengthening NASA’s Deep Space Network.
      NASA’s Deep Space Network, an array of giant radio antennas, allows agency missions to track, send commands to, and receive scientific data from spacecraft venturing to the Moon and beyond. NASA is adding a new antenna, bringing the total to 15, to support increased demand for the world’s largest and most sensitive radio frequency telecommunication system.
      Installation of the latest antenna took place on Dec. 18, when teams at NASA’s Goldstone Deep Space Communications Complex near Barstow, California, installed the metal reflector framework for Deep Space Station 23, a multifrequency beam-waveguide antenna. When operational in 2026, Deep Space Station 23 will receive transmissions from missions such as Perseverance, Psyche, Europa Clipper, Voyager 1, and a growing fleet of future human and robotic spacecraft in deep space.
      “This addition to the Deep Space Network represents a crucial communication upgrade for the agency,” said Kevin Coggins, deputy associate administrator of NASA’s SCaN (Space Communications and Navigation) program. “The communications infrastructure has been in continuous operation since its creation in 1963, and with this upgrade we are ensuring NASA is ready to support the growing number of missions exploring the Moon, Mars, and beyond.”
      This time-lapse video shows the entire day of construction activities for the Deep Space Station 23 antenna at the NASA Deep Space Network’s Goldstone Space Communications Complex near Barstow, California, on Dec. 18. NASA/JPL-Caltech Construction of the new antenna has been under way for more than four years, and during the installation, teams used a crawler crane to lower the 133-ton metal skeleton of the 112-foot-wide (34-meter-wide) parabolic reflector before it was bolted to a 65-foot-high (20-meter-high) alidade, a platform above the antenna’s pedestal that will steer the reflector during operations.
      “One of the biggest challenges facing us during the lift was to ensure that 40 bolt-holes were perfectly aligned between the structure and alidade,” said Germaine Aziz, systems engineer, Deep Space Network Aperture Enhancement Program of NASA’s Jet Propulsion Laboratory in Southern California. “This required a meticulous emphasis on alignment prior to the lift to guarantee everything went smoothly on the day.”
      Following the main lift, engineers carried out a lighter lift to place a quadripod, a four-legged support structure weighing 16 1/2 tons, onto the center of the upward-facing reflector. The quadripod features a curved subreflector that will direct radio frequency signals from deep space that bounce off the main reflector into the antenna’s pedestal, where the antenna’s receivers are housed.
      In the early morning of Dec. 18, a crane looms over the 112-foot-wide (34-meter-wide) steel framework for Deep Space Station 23 reflector dish, which will soon be lowered into position on the antenna’s base structure.NASA/JPL-Caltech Engineers will now work to fit panels onto the steel skeleton to create a curved surface to reflect radio frequency signals. Once complete, Deep Space Station 23 will be the fifth of six new beam-waveguide antennas to join the network, following Deep Space Station 53, which was added at the Deep Space Network’s Madrid complex in 2022.
      “With the Deep Space Network, we are able to explore the Martian landscape with our rovers, see the James Webb Space Telescope’s stunning cosmic observations, and so much more,” said Laurie Leshin, director of JPL. “The network enables over 40 deep space missions, including the farthest human-made objects in the universe, Voyager 1 and 2. With upgrades like these, the network will continue to support humanity’s exploration of our solar system and beyond, enabling groundbreaking science and discovery far into the future.”
      NASA’s Deep Space Network is managed by JPL, with the oversight of NASA’s SCaN Program. More than 100 NASA and non-NASA missions rely on the Deep Space Network and Near Space Network, including supporting astronauts aboard the International Space Station and future Artemis missions, monitoring Earth’s weather and the effects of climate change, supporting lunar exploration, and uncovering the solar system and beyond. 
      For more information about the Deep Space Network, visit:
      https://www.nasa.gov/communicating-with-missions/dsn
      News Media Contact
      Ian J. O’Neill
      Jet Propulsion Laboratory, Pasadena, Calif.
      818-354-2649
      ian.j.oneill@jpl.nasa.gov
      2024-179
      Share
      Details
      Last Updated Dec 20, 2024 Related Terms
      Deep Space Network Jet Propulsion Laboratory Space Communications & Navigation Program Space Operations Mission Directorate Explore More
      4 min read Lab Work Digs Into Gullies Seen on Giant Asteroid Vesta by NASA’s Dawn
      Article 8 hours ago 5 min read Avalanches, Icy Explosions, and Dunes: NASA Is Tracking New Year on Mars
      Article 9 hours ago 8 min read NASA’s Kennedy Space Center Looks to Thrive in 2025
      Article 2 days ago Keep Exploring Discover Related Topics
      Missions
      Humans in Space
      Climate Change
      Solar System
      View the full article
    • By NASA
      5 Min Read NASA’s Ames Research Center Celebrates 85 Years of Innovation
      The NACA Ames laboratory in 1944 Credits: NASA Ames Research Center in California’s Silicon Valley pre-dates a lot of things. The center existed before NASA – the very space and aeronautics agency it’s a critical part of today. And of all the marvelous advancements in science and technology that have fundamentally changed our lives over the last 85 years since its founding, one aspect has remained steadfast; an enduring commitment to what’s known by some on-center simply as, “an atmosphere of freedom.” 
      Years before breaking ground at the site that would one day become home to the world’s preeminent wind tunnels, supercomputers, simulators, and brightest minds solving some of the world’s toughest challenges, Joseph Sweetman Ames, the center’s namesake, described a sentiment that would guide decades of innovation and research: 
      My hope is that you have learned or are learning a love of freedom of thought and are convinced that life is worthwhile only in such an atmosphere
      Joseph sweetman ames
      Founding member of the N.A.C.A.
      “My hope is that you have learned or are learning a love of freedom of thought and are convinced that life is worthwhile only in such an atmosphere,” he said in an address to the graduates of Johns Hopkins University in June 1935.
      That spirit and the people it attracted and retained are a crucial part of how Ames, along with other N.A.C.A. research centers, ultimately made technological breakthroughs that enabled humanity’s first steps on the Moon, the safe return of spacecraft through Earth’s atmosphere, and many other discoveries that benefit our day-to-day lives.
      Russell Robinson momentarily looks to the camera while supervising the first excavation at what would become Ames Research Center.NACA “In the context of my work, an atmosphere of freedom means the freedom to pursue high-risk, high-reward, innovative ideas that may take time to fully develop and — most importantly — the opportunity to put them into practice for the benefit of all,” said Edward Balaban, a researcher at Ames specializing in artificial intelligence, robotics, and advanced mission concepts.
      Balaban’s career at Ames has involved a variety of projects at different stages of development – from early concept to flight-ready – including experimenting with different ways to create super-sized space telescopes in space and using artificial intelligence to help guide the path a rover might take to maximize off-world science results. Like many Ames researchers over the years, Balaban shared that his experience has involved deep collaborations across science and engineering disciplines with colleagues all over the center, as well as commercial and academic partners in Silicon Valley where Ames is nestled and beyond. This is a tradition that runs deep at Ames and has helped lead to entirely new fields of study and seeded many companies and spinoffs.
      Before NASA, Before Silicon Valley: The 1939 Founding of Ames Aeronautical Laboratory “In the fields of aeronautics and space exploration the cost of entry can be quite high. For commercial enterprises and universities pursuing longer term ideas and putting them into practice often means partnering up with an organization such as NASA that has the scale and multi-disciplinary expertise to mature these ideas for real-world applications,” added Balaban.
      “Certainly, the topics of inquiry, the academic freedom, and the benefit to the public good are what has kept me at Ames,” reflected Ross Beyer, a planetary scientist with the SETI Institute at Ames. “There’s not a lot of commercial incentive to study other planets, for example, but maybe there will be soon. In the meantime, only with government funding and agencies like NASA can we develop missions to explore the unknown in order to make important fundamental science discoveries and broadly share them.”
      For Beyer, his boundary-breaking moment came when he searched – and found – software engineers at Ames capable and passionate about open-source software to generate accurate, high-resolution, texture-mapped, 3D terrain models from stereo image pairs. He and other teams of NASA scientists have since applied that software to study and better understand everything from changes in snow and ice characteristics on Earth, as well as features like craters, mountains, and caves on Mars or the Moon. This capability is part of the Artemis campaign, through which NASA will establish a long-term presence at the Moon for scientific exploration with commercial and international partners. The mission is to learn how to live and work away from home, promote the peaceful use of space, and prepare for future human exploration of Mars. 
      “As NASA and private companies send missions to the Moon, they need to plan landing sites and understand the local environment, and our software is freely available for anyone to use,” Beyer said. “Years ago, our management could easily have said ‘No, let’s keep this software to ourselves; it gives us a competitive advantage.’ They didn’t, and I believe that NASA writ large allows you to work on things and share those things and not hold them back.” 
      When looking forward to what the next 85 years might bring, researchers shared a belief that advancements in technology and opportunities to innovate are as expansive as space itself, but like all living things, they need a healthy atmosphere to thrive. Balaban offered, “This freedom to innovate is precious and cannot be taken for granted. It can easily fall victim if left unprotected. It is absolutely critical to retain it going forward, to ensure our nation’s continuing vitality and the strength of the other freedoms we enjoy.”
      Ames Aeronautical Laboratory.NACAView the full article
    • By NASA
      NASA’s Dawn spacecraft captured this image of Vesta as it left the giant asteroid’s orbit in 2012. The framing camera was looking down at the north pole, which is in the middle of the image.NASA/JPL-Caltech/UCLA/MPS/DLR/IDA Known as flow formations, these channels could be etched on bodies that would seem inhospitable to liquid because they are exposed to the extreme vacuum conditions of space.
      Pocked with craters, the surfaces of many celestial bodies in our solar system provide clear evidence of a 4.6-billion-year battering by meteoroids and other space debris. But on some worlds, including the giant asteroid Vesta that NASA’s Dawn mission explored, the surfaces also contain deep channels, or gullies, whose origins are not fully understood.
      A prime hypothesis holds that they formed from dry debris flows driven by geophysical processes, such as meteoroid impacts, and changes in temperature due to Sun exposure. A recent NASA-funded study, however, provides some evidence that impacts on Vesta may have triggered a less-obvious geologic process: sudden and brief flows of water that carved gullies and deposited fans of sediment. By using lab equipment to mimic conditions on Vesta, the study, which appeared in Planetary Science Journal, detailed for the first time what the liquid could be made of and how long it would flow before freezing.
      Although the existence of frozen brine deposits on Vesta is unconfirmed, scientists have previously hypothesized that meteoroid impacts could have exposed and melted ice that lay under the surface of worlds like Vesta. In that scenario, flows resulting from this process could have etched gullies and other surface features that resemble those on Earth.
      To explore potential explanations for deep channels, or gullies, seen on Vesta, scientists used JPL’s Dirty Under-vacuum Simulation Testbed for Icy Environments, or DUSTIE, to simulate conditions on the giant asteroid that would occur after meteoroids strike the surface.NASA/JPL-Caltech But how could airless worlds — celestial bodies without atmospheres and exposed to the intense vacuum of space — host liquids on the surface long enough for them to flow? Such a process would run contrary to the understanding that liquids quickly destabilize in a vacuum, changing to a gas when the pressure drops.
      “Not only do impacts trigger a flow of liquid on the surface, the liquids are active long enough to create specific surface features,” said project leader and planetary scientist Jennifer Scully of NASA’s Jet Propulsion Laboratory in Southern California, where the experiments were conducted. “But for how long? Most liquids become unstable quickly on these airless bodies, where the vacuum of space is unyielding.”
      The critical component turns out to be sodium chloride — table salt. The experiments found that in conditions like those on Vesta, pure water froze almost instantly, while briny liquids stayed fluid for at least an hour. “That’s long enough to form the flow-associated features identified on Vesta, which were estimated to require up to a half-hour,” said lead author Michael J. Poston of the Southwest Research Institute in San Antonio.
      Launched in 2007, the Dawn spacecraft traveled to the main asteroid belt between Mars and Jupiter to orbit Vesta for 14 months and Ceres for almost four years. Before ending in 2018, the mission uncovered evidence that Ceres had been home to a subsurface reservoir of brine and may still be transferring brines from its interior to the surface. The recent research offers insights into processes on Ceres but focuses on Vesta, where ice and salts may produce briny liquid when heated by an impact, scientists said.
      Re-creating Vesta
      To re-create Vesta-like conditions that would occur after a meteoroid impact, the scientists relied on a test chamber at JPL called the Dirty Under-vacuum Simulation Testbed for Icy Environments, or DUSTIE. By rapidly reducing the air pressure surrounding samples of liquid, they mimicked the environment around fluid that comes to the surface. Exposed to vacuum conditions, pure water froze instantly. But salty fluids hung around longer, continuing to flow before freezing.
      The brines they experimented with were a little over an inch (a few centimeters) deep; scientists concluded the flows on Vesta that are yards to tens of yards deep would take even longer to refreeze.
      The researchers were also able to re-create the “lids” of frozen material thought to form on brines. Essentially a frozen top layer, the lids stabilize the liquid beneath them, protecting it from being exposed to the vacuum of space — or, in this case the vacuum of the DUSTIE chamber — and helping the liquid flow longer before freezing again.
      This phenomenon is similar to how on Earth lava flows farther in lava tubes than when exposed to cool surface temperatures. It also matches up with modeling research conducted around potential mud volcanoes on Mars and volcanoes that may have spewed icy material from volcanoes on Jupiter’s moon Europa.
      “Our results contribute to a growing body of work that uses lab experiments to understand how long liquids last on a variety of worlds,” Scully said.
      Find more information about NASA’s Dawn mission here:
      https://science.nasa.gov/mission/dawn/
      News Media Contacts
      Gretchen McCartney
      Jet Propulsion Laboratory, Pasadena, Calif.
      818-287-4115
      gretchen.p.mccartney@jpl.nasa.gov 
      Karen Fox / Molly Wasser
      NASA Headquarters, Washington
      202-358-1600
      karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
      2024-178
      Share
      Details
      Last Updated Dec 20, 2024 Related Terms
      Dawn Asteroids Ceres Jet Propulsion Laboratory Vesta Explore More
      5 min read Avalanches, Icy Explosions, and Dunes: NASA Is Tracking New Year on Mars
      Article 1 hour ago 5 min read Cutting-Edge Satellite Tracks Lake Water Levels in Ohio River Basin
      Article 3 days ago 5 min read NASA Mars Orbiter Spots Retired InSight Lander to Study Dust Movement
      Article 4 days ago Keep Exploring Discover More Topics From NASA
      Missions
      Humans in Space
      Climate Change
      Solar System
      View the full article
    • By NASA
      “Trying to do stellar observations from Earth is like trying to do birdwatching from the bottom of a lake.” James B. Odom, Hubble Program Manager 1983-1990.

      The third servicing mission to the Hubble Space Telescope, placed in orbit in 1990, occurred during the STS-103 mission in December 1999. During the mission, originally planned for June 2000 but accelerated by six months following unexpected failures of the telescope’s attitude control gyroscopes, the astronauts restored the facility to full functionality. During their eight-day mission that featured the first space shuttle crew to spend Christmas in space, the seven-member U.S. and European crew rendezvoused with and captured Hubble, and four astronauts in rotating teams of two conducted three lengthy and complex spacewalks to service and upgrade the telescope. They redeployed the telescope with greater capabilities than ever before to continue its mission to help scientists unlock the secrets of the universe.
      Schematic showing the Hubble Space Telescope’s major components. Workers inspect the Hubble Space Telescope’s 94-inch diameter primary mirror prior to assembly. Astronauts release the Hubble Space Telescope in April 1990 during the STS-31 mission. The discovery after the Hubble Space Telescope’s launch in 1990 that its primary mirror suffered from a flaw called spherical aberration disappointed scientists who could not obtain the sharp images they had expected. But thanks to the Hubble’s built-in feature of on-orbit servicing, NASA devised a plan to correct the telescope’s optics during the first planned repair mission in 1993. A second servicing mission in 1997 upgraded the telescope’s capabilities until the next mission planned for three years later. But after three of the telescope’s six gyroscopes failed in 1997, 1998, and 1999, mission rules dictated a call up mission in case additional gyroscope failures sent Hubble into a safe mode. NASA elected to move up some of the servicing tasks from the third mission, splitting it into missions 3A and 3B, planning to fly 3A in October 1999 on Discovery’s STS-103 mission primarily to replace the failed gyroscopes. Delays to the shuttle fleet resulting from anomalies during the launch of STS-93 in July 1993 slipped STS-103 first into November and ultimately into December. Technical issues with Discovery itself pushed the launch date to mid-December, and raised concerns about having a shuttle in orbit during the Y2K transition. Once the launch had slipped to Dec. 19, mission planners cut the mission from 10 to eight days, deleting one of the four spacewalks, to ensure a return before the end of the calendar year. The servicing mission couldn’t come soon enough, as a fourth gyroscope failed aboard Hubble in mid-November, with Discovery already poised on the launch pad to prepare for STS-103. Controllers placed Hubble in a safe mode until the astronauts arrived.
      The STS-103 crew of C. Michael Foale, left, Claude Nicollier, Scott J. Kelly, Curtis L. Brown, Jean-François A. Clervoy, John M. Grunsfeld, and Steven L. Smith. The STS-103 crew patch. The mission patch for the Hubble Servicing Mission-3A. To execute the third Hubble Servicing Mission, in July 1998 NASA selected an experienced four-person team to carry out a record-breaking six spacewalks on the flight then planned for June 2000. The spacewalkers included Mission Specialists Steven L. Smith serving as payload commander, John M. Grunsfeld, C. Michael Foale, and European Space Agency (ESA) astronaut Claude Nicollier from Switzerland. The addition in March 1999 of Commander Curtis L. Brown, Pilot Scott J. Kelly, and Mission Specialist ESA astronaut Jean-François A. Clervoy of France rounded out the highly experienced crew with 18 previous spaceflights among them. Brown earned the distinction as only the fifth person to fly in space six times. For Kelly, STS-103 marked his first spaceflight. Smith, Clervoy, and Grunsfeld each had flown two previous missions, Foale four including a long-duration mission aboard Mir, and Nicollier three. Smith participated in three spacewalks during the second Hubble Servicing Mission and Nicollier served as the Remote Manipulator System (RMS) or robotic arm operator during the first.
      The STS-103 crew at the traditional prelaunch breakfast at NASA’s Kennedy Space Center in Florida. Suited up, the STS-103 astronauts leave crew quarters for the trip to Launch Pad 39B. Space shuttle Discovery on Launch Pad 39B, awaiting launch. Discovery arrived back to KSC at the end of the STS-96 mission on June 6, 1999, and workers towed it to the Orbiter Processing Facility the same day to begin readying it for STS-103. The vehicle rolled over to the Vehicle Assembly Building on Nov. 4, where workers mated it with its external tank and twin solid rocket boosters, before rolling the stack out to Launch Pad 39B on Nov. 13.
      Liftoff of space shuttle Discovery on the STS-103 Hubble Space Telescope servicing mission 3A. The Hubble Space Telescope as Discovery approaches. The STS-103 crew berthing the Hubble into the payload bay. Beginning its 27th trip into space, Discovery lifted off from Launch Pad 39B at 7:50 p.m. EST on Dec. 19 to fix the ailing space telescope. Two days later, Brown and Kelly maneuvered Discovery to within range of Hubble so Clervoy operating the 50-foot-long RMS could grapple the telescope and berth it into the payload bay.
      During the first spacewalk, astronauts John M. Grunsfeld, left, and Steven L. Smith replacing one of the Rate Sensor Units containing two gyroscopes. Smith gives a thumbs up with his image reflected in the Hubble Space Telescope. Smith and Grunsfeld conducted the mission’s first spacewalk on Dec. 22, the flight’s fourth day in space. The duo, aided by Clervoy operating the RMS from inside Discovery, completed two of mission’s highest priority objectives. They replaced the failed gyroscopes, installing three new Rate Sensor Units, each containing two gyroscopes, to return control to the ailing telescope. They also installed six Voltage/Temperature Improvement Kits to prevent the telescope’s batteries from overheating as they aged. The excursion lasted eight hours 15 minutes, at the time the second longest spacewalk.
      During the second spacewalk, astronauts C. Michael Foale, left, and Claude Nicollier during the changeout of the fine guidance sensor. Foale at the end of the Remote Manipulator System services the Hubble Space Telescope. The next day, Nicollier and Foale conducted the mission’s second spacewalk. The main task for this excursion involved installing a new computer aboard Hubble, replacing the original 1970s vintage unit. The new radiation-hardened system ran 20 times faster and carried six times more memory while using one-third the electrical power. They also installed a fine guidance sensor before concluding the eight-hour 10-minute spacewalk.
      Astronauts Steven L. Smith, left, and John M. Grunsfeld begin their servicing activities during the third spacewalk. At the end of the third and final spacewalk, Grunsfeld, left, and Smith provide closing comments about the work the mission accomplished to service the Hubble Space Telescope. Smith and Grunsfeld ventured outside for a second time to complete the flight’s third and final spacewalk on Dec. 24, the first spacewalk conducted on Christmas Eve day. First, they replaced an old reel-to-reel tape recorder with a solid state unit providing a 10-fold increase in recording capability and replaced a failed data transmitter. They installed seven new covers on Hubble’s electronics bay doors for added protection of the telescope’s insulation. This third spacewalk lasted eight hours eight minutes.
      The first space shuttle crew to celebrate Christmas in space, the STS-103 astronauts pose wearing Santa hats. The Hubble Space Telescope shortly after the STS-103 crew released it. The next day, the STS-103 astronauts earned the distinction as the first space shuttle crew to spend Christmas Day in space. Clervoy grappled Hubble, lifted it out of the payload bay and released it to continue its mission. Hubble Space Telescope Program Manager John H. Campbell said after the release, “The spacecraft is being guided by its new gyros under the control of its brand new computer. [It] is now orbiting freely and is in fantastic shape.” After deploying Hubble, the astronauts enjoyed a well-deserved Christmas dinner, with Clervoy providing French delicacies. The crew spent Dec. 26 readying Discovery for its return to Earth, including testing its reaction control system thrusters and aerodynamic surfaces and stowing unneeded gear.
      Astronauts Steven L. Smith, left, Claude Nicollier, and John M. Grunsfeld complete their fluid loading protocol and put on their launch and entry suits prior to reentry. Space shuttle Discovery makes a perfect night landing at NASA’s Kennedy Space Center in Florida. The crew welcome home ceremony at Ellington Field in Houston. On Dec. 27, the astronauts donned their launch and entry suits and prepared for the return to Earth. They closed the payload bay doors and fired Discovery’s engines to bring them out of orbit. Just before landing, Kelly lowered the craft’s landing gear and Brown guided Discovery to a smooth night landing at KSC, concluding a flight of seven days, 23 hours, 11 minutes. They circled the Earth 119 times. The flight marked Discovery’s last solo flight as all its subsequent missions docked with the International Space Station. Workers at KSC began readying it for its next mission, STS-92 in October 2000.

      The Hubble Space Telescope continues to operate today, far exceeding the five-year life extension expected from the last of the servicing missions in 2009. Joined in space by the James Webb Space Telescope in 2021, the two instruments together continue to image the skies across a broad range of the electromagnetic spectrum to provide scientists with the tools to gain unprecedented insights into the universe and its formation.

      Watch the STS-103 crew narrate a video of their Hubble servicing mission.
      View the full article
    • By European Space Agency
      Video: 00:10:27 In 1975, 10 European countries came together with a vision to collaborate on key space activities: science and astronomy, launch capabilities and space applications: the European Space Agency, ESA, was born.
      In 2025, we mark half a century of joint European achievement – filled with firsts and breakthroughs in science, exploration and technology, and the space infrastructure and economy that power Europe today.
       
      During the past five decades ESA has grown, developing ever bolder and bigger projects and adding more Member States, with Slovenia joining as the latest full Member State in January.
       
      We’ll also celebrate the 50th anniversary of ESA’s Estrack network, 30 years of satellite navigation in Europe and 20 years since ESA launched the first demonstration satellite Giove-A which laid the foundation for the EU’s own satnav constellation Galileo. Other notable celebrations are the 20th anniversary of ESA’s Business Incubation Centres, or BICs, and the 30th year in space for SOHO, the joint ESA and NASA Solar and Heliospheric Observatory.
       
      Sadly though, 2025 will mean end of science operations for Integral and Gaia. Integral, ESA's gamma-ray observatory has exotic objects in space since 2002 and Gaia concludes a decade of mapping the stars. But as some space telescopes retire, another one provides its first full data release. Launched in 2023, we expect Euclid’s data release early in the new year.
       
      Launch-wise, we’re looking forward to Copernicus Sentinel-4 and -5 (Sentinel-4 will fly on an MTG-sounder satellite and Sentinel-5 on the MetOp-SG-A1 satellite), Copernicus Sentinel-1D, Sentinel-6B and Biomass. We’ll also launch the SMILE mission, or Solar wind Magnetosphere Ionosphere Link Explorer, a joint mission with the Chinese academy of science.
       
      The most powerful version of Europe’s new heavy-lift rocket, Ariane 6, is set to fly operationally for the first time in 2025. With several European commercial launcher companies planning to conduct their first orbital launches in 2025 too, ESA is kicking off the European Launcher Challenge to support the further development of European space transportation industry.
       
      In human spaceflight, Polish ESA project astronaut Sławosz Uznański will fly to the ISS on the commercial Axiom-4 mission. Artemis II will be launched with the second European Service Module, on the first crewed mission around the Moon since 1972.
      The year that ESA looks back on a half century of European achievement will also be one of key decisions on our future. At the Ministerial Council towards the end of 2025, our Member States will convene to ensure that Europe's crucial needs, ambitions and the dreams that unite us in space become reality.
      So, in 2025, we’ll celebrate the legacy of those who came before but also help establish a foundation for the next 50 years. Join us as we look forward to a year that honours ESA’s legacy and promises new milestones in space.
      View the full article
  • Check out these Videos

×
×
  • Create New...