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ExoMars orbiter continues hunt for key signs of life on Mars
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By NASA
The Crew Health and Performance Exploration Analog (CHAPEA) team hosts a media day at NASA’s Johnson Space Center in Houston in 2023.Credit: NASA As NASA prepares for its second year-long Mars simulated mission, media are invited to visit the ground-based habitat where the mission will take place, on Friday, Aug. 22, at the agency’s Johnson Space Center in Houston.
Scheduled to begin in October, four volunteer crew members will enter the agency’s Crew Health and Performance Exploration Analog (CHAPEA) 3D-printed habitat to live and work for a year to inform NASA’s preparations for human Mars missions.
The in-person media event includes an opportunity to speak with subject matter experts, and capture b-roll and photos inside the habitat. Crew members will not be available for interviews as they will arrive at NASA Johnson at a later date.
International media wishing to attend must request accreditation no later than 6 p.m. EDT (5 p.m. CDT), on Monday, Aug. 11. United States-based media have a deadline of 6 p.m. EDT (5 p.m. CDT), on Wednesday, Aug. 20, to register.
To request accreditation, media must contact the NASA Johnson newsroom at: 281-483-5111 or jsccommu@mail.nasa.gov. Space is limited. A copy of NASA’s media accreditation policy is available online.
Once the crew members kick off their mission, they will carry out various activities, including simulated Mars walks, robotic operations, habitat maintenance, medical technology tests, exercise, and crop growth. The crew also will face environmental stresses such as resource limitations, isolation, communication delays, and equipment failure, and work through these scenarios with the resources available inside the habitat.
To learn more about CHAPEA, visit:
https://www.nasa.gov/humans-in-space/chapea
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Lauren Low
Headquarters, Washington
202-358-1600
lauren.e.low@nasa.gov
Kelsey Spivey / Mohi Kumar
Johnson Space Center, Houston
281-483-5111
kelsey.m.spivey@nasa.gov / mohi.kumar@nasa.gov
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Last Updated Aug 04, 2025 LocationNASA Headquarters Related Terms
Crew Health and Performance Exploration Analog (CHAPEA) Humans in Space Johnson Space Center View the full article
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
This view of tracks trailing NASA’s Curiosity was captured July 26, 2025, as the rover simultaneously relayed data to a Mars orbiter. Combining tasks like this more efficiently uses energy generated by Curiosity’s nuclear power source, seen here lined with rows of white fins at the back of the rover.NASA/JPL-Caltech This is the same view of Curiosity’s July 25 mosaic, with labels indicating some key parts of the rover involved in recent efficiency improvements, plus a few prominent locations in the distance.NASA/JPL-Caltech New capabilities allow the rover to do science with less energy from its batteries.
Thirteen years since Curiosity landed on Mars, engineers are finding ways to make the NASA rover even more productive. The six-wheeled robot has been given more autonomy and the ability to multitask — improvements designed to make the most of Curiosity’s energy source, a multi-mission radioisotope thermoelectric generator (MMRTG). Increased efficiency means the rover has ample power as it continues to decipher how the ancient Martian climate changed, transforming a world of lakes and rivers into the chilly desert it is today.
Curiosity recently rolled into a region filled with boxwork formations. These hardened ridges are believed to have been created by underground water billions of years ago. Stretching for miles on this part of Mount Sharp, a 3-mile-tall (5-kilometer-tall) mountain, the formations might reveal whether microbial life could have survived in the Martian subsurface eons ago, extending the period of habitability farther into when the planet was drying out.
NASA’s Curiosity viewed this rock shaped like a piece of coral on July 24, 2025, the 4,608th Martian day of the mission. The rover has found many rocks that — like this one — were formed by minerals deposited by ancient water flows combined with billions of years of sandblasting by wind.NASA/JPL-Caltech/MSSS Carrying out this detective work involves a lot of energy. Besides driving and extending a robotic arm to study rocks and cliffsides, Curiosity has a radio, cameras, and 10 science instruments that all need power. So do the multiple heaters that keep electronics, mechanical parts, and instruments operating at their best. Past missions like the Spirit and Opportunity rovers and the InSight lander relied on solar panels to recharge their batteries, but that technology always runs the risk of not receiving enough sunlight to provide power.
Instead, Curiosity and its younger sibling Perseverance each use their MMRTG nuclear power source, which relies on decaying plutonium pellets to create energy and recharge the rover’s batteries. Providing ample power for the rovers’ many science instruments, MMRTGs are known for their longevity (the twin Voyager spacecraft have relied on RTGs since 1977). But as the plutonium decays over time, it takes longer to recharge Curiosity’s batteries, leaving less energy for science each day.
The team carefully manages the rover’s daily power budget, factoring in every device that draws on the batteries. While these components were all tested extensively before launch, they are part of complex systems that reveal their quirks only after years in the extreme Martian environment. Dust, radiation, and sharp temperature swings bring out edge cases that engineers couldn’t have expected.
“We were more like cautious parents earlier in the mission,” said Reidar Larsen of NASA’s Jet Propulsion Laboratory in Southern California, which built and operates the rover. Larsen led a group of engineers who developed the new capabilities. “It’s as if our teenage rover is maturing, and we’re trusting it to take on more responsibility. As a kid, you might do one thing at a time, but as you become an adult, you learn to multitask.”
More Efficient Science
Generally, JPL engineers send Curiosity a list of tasks to complete one by one before the rover ends its day with a nap to recharge. In 2021, the team began studying whether two or three rover tasks could be safely combined, reducing the amount of time Curiosity is active.
For example, Curiosity’s radio regularly sends data and images to a passing orbiter, which relays them to Earth. Could the rover talk to an orbiter while driving, moving its robotic arm, or snapping images? Consolidating tasks could shorten each day’s plan, requiring less time with heaters on and instruments in a ready-to-use state, reducing the energy used. Testing showed Curiosity safely could, and all of these have now been successfully demonstrated on Mars.
Another trick involves letting Curiosity decide to nap if it finishes its tasks early. Engineers always pad their estimates for how long a day’s activity will take just in case hiccups arise. Now, if Curiosity completes those activities ahead of the time allotted, it will go to sleep early.
By letting the rover manage when it naps, there is less recharging to do before the next day’s plan. Even actions that trim just 10 or 20 minutes from a single activity add up over the long haul, maximizing the life of the MMRTG for more science and exploration down the road.
Miles to Go
In fact, the team has been implementing other new capabilities on Curiosity for years. Several mechanical issues required a rework of how the robotic arm’s rock-pulverizing drill collects samples, and driving capabilities have been enhanced with software updates. When a color filter wheel stopped turning on one of the two cameras mounted on Mastcam, Curiosity’s swiveling “head,” the team developed a workaround allowing them to capture the same beautiful panoramas.
JPL also developed an algorithm to reduce wear on Curiosity’s rock-battered wheels. And while engineers closely monitor any new damage, they aren’t worried: After 22 miles (35 kilometers) and extensive research, it’s clear that, despite some punctures, the wheels have years’ worth of travel in them. (And in a worst-case scenario, Curiosity could remove the damaged part of the wheel’s “tread” and still drive on the remaining part.)
Together, these measures are doing their job to keep Curiosity as busy as ever.
More About Curiosity
Curiosity was built by NASA’s Jet Propulsion Laboratory, which is managed by Caltech in Pasadena, California. JPL leads the mission on behalf of NASA’s Science Mission Directorate in Washington as part of NASA’s Mars Exploration Program portfolio. Malin Space Science Systems in San Diego built and operates Mastcam.
For more about Curiosity, visit:
science.nasa.gov/mission/msl-curiosity
News Media Contacts
Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-2433
andrew.c.good@jpl.nasa.gov
Karen Fox / Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
2025-098
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Last Updated Aug 04, 2025 Related Terms
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By NASA
5 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Europa Clipper’s radar instrument received echoes of its very-high-frequency radar signals that bounced off Mars and were processed to develop this radargram. What looks like a skyline is the outline of the topography beneath the spacecraft.NASA/JPL-Caltech/UT-Austin The agency’s largest interplanetary probe tested its radar during a Mars flyby. The results include a detailed image and bode well for the mission at Jupiter’s moon Europa.
As it soared past Mars in March, NASA’s Europa Clipper conducted a critical radar test that had been impossible to accomplish on Earth. Now that mission scientists have studied the full stream of data, they can declare success: The radar performed just as expected, bouncing and receiving signals off the region around Mars’ equator without a hitch.
Called REASON (Radar for Europa Assessment and Sounding: Ocean to Near-surface), the radar instrument will “see” into Europa’s icy shell, which may have pockets of water inside. The radar may even be able to detect the ocean beneath the shell of Jupiter’s fourth-largest moon.
“We got everything out of the flyby that we dreamed,” said Don Blankenship, principal investigator of the radar instrument, of the University of Texas at Austin. “The goal was to determine the radar’s readiness for the Europa mission, and it worked. Every part of the instrument proved itself to do exactly what we intended.”
In this artist’s concept, Europa Clipper’s radar antennas — seen at the lower edge of the solar panels — are fully deployed. The antennas are key components of the spacecraft’s radar instrument, called REASON.NASA/JPL-Caltech The radar will help scientists understand how the ice may capture materials from the ocean and transfer them to the surface of the moon. Above ground, the instrument will help to study elements of Europa’s topography, such as ridges, so scientists can examine how they relate to features that REASON images beneath the surface.
Limits of Earth
Europa Clipper has an unusual radar setup for an interplanetary spacecraft: REASON uses two pairs of slender antennas that jut out from the solar arrays, spanning a distance of about 58 feet (17.6 meters). Those arrays themselves are huge — from tip to tip, the size of a basketball court — so they can catch as much light as possible at Europa, which gets about 1/25th the sunlight as Earth.
The instrument team conducted all the testing that was possible prior to the spacecraft’s launch from NASA’s Kennedy Space Center in Florida on Oct. 14, 2024. During development, engineers at the agency’s Jet Propulsion Laboratory in Southern California even took the work outdoors, using open-air towers on a plateau above JPL to stretch out and test engineering models of the instrument’s spindly high-frequency and more compact very-high-frequency antennas.
But once the actual flight hardware was built, it needed to be kept sterile and could be tested only in an enclosed area. Engineers used the giant High Bay 1 clean room at JPL, where the spacecraft was assembled, to test the instrument piece by piece. To test the “echo,” or the bounceback of REASON’s signals, however, they’d have needed a chamber about 250 feet (76 meters) long — nearly three-quarters the length of a football field.
Enter Mars
The mission’s primary goal in flying by Mars on March 1, less than five months after launch, was to use the planet’s gravitational pull to reshape the spacecraft’s trajectory. But it also presented opportunities to calibrate the spacecraft’s infrared camera and perform a dry run of the radar instrument over terrain NASA scientists have been studying for decades.
As Europa Clipper zipped by the volcanic plains of the Red Planet — starting at 3,100 miles (5,000 kilometers) down to 550 miles (884 kilometers) above the surface — REASON sent and received radio waves for about 40 minutes. In comparison, at Europa the instrument will operate as close as 16 miles (25 kilometers) from the moon’s surface.
All told, engineers were able to collect 60 gigabytes of rich data from the instrument. Almost immediately, they could tell REASON was working well. The flight team scheduled the full dataset to download, starting in mid-May. Scientists relished the opportunity over the next couple of months to examine the information in detail and compare notes.
“The engineers were excited that their test worked so perfectly,” said JPL’s Trina Ray, Europa Clipper deputy science manager. “All of us who had worked so hard to make this test happen — and the scientists seeing the data for the first time — were ecstatic, saying, ‘Oh, look at this! Oh, look at that!’ Now, the science team is getting a head start on learning how to process the data and understand the instrument’s behavior compared to models. They are exercising those muscles just like they will out at Europa.”
Europa Clipper’s total journey to reach the icy moon will be about 1.8 billion miles (2.9 billion kilometers) and includes one more gravity assist — using Earth — in 2026. The spacecraft is currently about 280 million miles (450 million kilometers) from Earth.
More About Europa Clipper
Europa Clipper’s three main science objectives are to determine the thickness of the moon’s icy shell and its interactions with the ocean below, to investigate its composition, and to characterize its geology. The mission’s detailed exploration of Europa will help scientists better understand the astrobiological potential for habitable worlds beyond our planet.
Managed by Caltech in Pasadena, California, NASA’s Jet Propulsion Laboratory in Southern California leads the development of the Europa Clipper mission in partnership with the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, for NASA’s Science Mission Directorate in Washington. APL designed the main spacecraft body in collaboration with JPL and NASA’s Goddard Space Flight Center in Greenbelt, Maryland, NASA’s Marshall Space Flight Center in Huntsville, Alabama, and Langley Research Center in Hampton, Virginia. The Planetary Missions Program Office at NASA Marshall executes program management of the Europa Clipper mission. NASA’s Launch Services Program, based at NASA Kennedy, managed the launch service for the Europa Clipper spacecraft. The REASON radar investigation is led by the University of Texas at Austin.
Find more information about Europa Clipper here:
https://science.nasa.gov/mission/europa-clipper/
Check out Europa Clipper's Mars flyby in 3D 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.govt
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Last Updated Aug 01, 2025 Related Terms
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By NASA
Technicians have successfully installed two sunshields onto NASA’s Nancy Grace Roman Space Telescope’s inner segment. Along with the observatory’s Solar Array Sun Shield and Deployable Aperture Cover, the panels (together called the Lower Instrument Sun Shade), will play a critical role in keeping Roman’s instruments cool and stable as the mission explores the infrared universe.
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This video shows technicians installing two sunshields onto NASA's nearly complete Nancy Grace Roman Space Telescope on July 17. The large yet lightweight panels will block sunlight, keeping Roman’s instruments cool and stable as the mission explores the infrared universe.Credit: NASA/Sophia Roberts The team is on track to join Roman’s outer and inner assemblies this fall to complete the full observatory, which can then undergo further prelaunch testing.
“This shield is like an extremely strong sunblock for Roman’s sensitive instruments, protecting them from heat and light from the Sun that would otherwise overwhelm our ability to detect faint signals from space,” said Matthew Stephens, an aerospace engineer at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
The sunshade, which was designed and engineered at NASA Goddard, is essentially an extension of Roman’s solar panels, except without solar cells. Each sunshade flap is roughly the size of a garage door — about 7 by 7 feet (2.1 by 2.1 meters) — and 3 inches (7.6 centimeters) thick.
“They’re basically giant aluminum sandwiches, with metal sheets as thin as a credit card on the top and bottom and the central portion made up of a honeycomb structure,” said Conrad Mason, an aerospace engineer at NASA Goddard.
This design makes the panels lightweight yet stiff, and the material helps limit heat transfer from the side facing the Sun to the back—no small feat considering the front will be hot enough to boil water (up to 216 degrees Fahrenheit, or 102 degrees Celsius) while the back will be much colder than Antarctica’s harshest winter (minus 211 Fahrenheit, or minus 135 Celsius). A specialized polymer film blanket will wrap around each panel to temper the heat, with 17 layers on the Sun side and one on the shaded side.
The sunshade will be stowed and gently deploy around an hour after launch.
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In this time-lapse video, technicians manually deploy the Lower Instrument Sun Shield for NASA's Nancy Grace Roman Space Telescope. The test helps verify the panels will operate as designed in space.NASA/Sophia Roberts “The deploying mechanisms have dampers that work like soft-close hinges for drawers or cabinets, so the panels won’t slam open and rattle the observatory,” Stephens said. “They each take about two minutes to move into their final positions. This is the very first system that Roman will deploy in space after the spacecraft separates from the launch vehicle.”
Now completely assembled, Roman’s inner segment is slated to undergo a 70-day thermal vacuum test next. Engineers and scientists will test the full functionality of the spacecraft, telescope, and instruments under simulated space conditions. Following the test, the sunshade will be temporarily removed while the team joins Roman’s outer and inner assemblies, and then reattached to complete the observatory. The mission remains on track for launch no later than May 2027 with the team aiming for as early as fall 2026.
Click here to virtually tour an interactive version of the telescope Download high-resolution video and images from NASA’s Scientific Visualization Studio
The Nancy Grace Roman Space Telescope is managed at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, with participation by NASA’s Jet Propulsion Laboratory in Southern California; Caltech/IPAC in Pasadena, California; the Space Telescope Science Institute in Baltimore; and a science team comprising scientists from various research institutions. The primary industrial partners are BAE Systems Inc. in Boulder, Colorado; L3Harris Technologies in Rochester, New York; and Teledyne Scientific & Imaging in Thousand Oaks, California.
By Ashley Balzer
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Last Updated Jul 31, 2025 EditorAshley BalzerContactAshley Balzerashley.m.balzer@nasa.govLocationGoddard Space Flight Center Related Terms
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By Space Force
Brig. Gen. Paul's appointment marks a major milestone in U.S.-Canada defense collaboration, particularly in the growing domain of space operations.
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