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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
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Last Updated Aug 01, 2025 Related Terms
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By NASA
Skywatching Skywatching Home What’s Up Meteor Showers Eclipses Daily Moon Guide More Tips & Guides Skywatching FAQ Night Sky Network Venus-Jupiter Conjunction and Meteor Mojo
Jupiter and Venus shine brightly in the mornings as they appear to graze each other in the sky on the 11th and 12th. The Perseids are washed out by the Moon.
Skywatching Highlights
All Month – Planet Visibility:
Mercury: Pops up above the horizon during the second half of August. Appears very low, below 10 degrees altitude. Venus: Shines very brightly in the east each morning before sunrise, about 20 to 30 degrees above the horizon. Mars: Can be observed low in the west during the hour after sunset, appearing about as bright as the brightest stars in the Big Dipper. Jupiter: Appears in the east each morning, together with Venus, but much less bright. Saturn: Observable late night to dawn. Rises around 10:30 p.m. early in the month, and around 8:30 p.m. by the end of the month. Find it high in the south as sunrise approaches. Skywatching Highlights:
August 11 & 12 – Venus-Jupiter Conjunction – The two brightest planets have a close meetup over several days, appearing closest over two days on the 11th and 12th, at just a degree apart.
August 19 & 20 – Moon with Jupiter & Venus – A slim lunar crescent joins Jupiter and Venus — still relatively close in the sky after their conjunction. They appear in the east in the several hours preceding sunrise.
August 12th-13th – Perseids Peak – The celebrated annual meteor shower will be hampered by an 84%-full Moon on the peak night. A few bright meteors may still be seen in the pre-dawn hours, but viewing conditions are not ideal this year.
All month – The Dumbbell Nebula (M27) – One of the easiest planetary nebulas to observe, M27 appears within the Summer Triangle star pattern, high overhead in the first half of the night.
Transcript
What’s Up for August? Jupiter and Venus have a morning meetup, we check out this year’s Perseid meteor shower, and peek into the future of our own Sun.
Mars is the lone planet in the early evening sky this month, visible low in the west for about an hour after the sky starts to darken. It’s now only about 60% as bright as it appeared back in May.
Saturn is rising by about 10 pm, and you’ll see it showing up a bit earlier each evening as the month goes on. You’ll find it in the east after dark with the constellations Cassiopeia and Andromeda. The Ringed Planet makes its way over to the western part of the sky by dawn, where early risers will find it on August mornings.
The real highlight of August is the close approach of Jupiter and Venus. They shine brightly in the east before sunrise throughout the month. The pair begin the month farther apart, but quickly approach each other in the sky. They appear at their closest on the 11th and 12th — only about a degree apart. Their rendezvous happens against a backdrop of bright stars including Orion, Taurus, Gemini, and Sirius. A slim crescent Moon joins the pair of planets after they separate again, on the mornings of the 19th and 20th.
Sky chart showing the eastern sky before sunrise on August 11th, with Venus and Jupiter only a degree apart. NASA/JPL-Caltech One of the best annual meteor showers, the Perseids, peaks overnight on August 12th and into the 13th. Unfortunately, this year the Moon is nearly full on the peak night, and its glare will wash out all but the brightest meteors. While that’s not so great for Perseid watchers, the good news is that another favorite annual meteor shower, the Geminids, is poised for Moon-free viewing in December.
August is a great time to see one of the easiest-to-observe nebulas in the sky.
The Dumbbell Nebula, also known as M27, is high overhead on August nights. It’s a type of nebula called a “planetary nebula.”
A nebula is a giant cloud of gas and dust in space, and planetary nebulas are produced by stars like our Sun when they become old and nuclear fusion ceases inside them. They blow off their outer layers, leaving behind a small, hot remnant called a white dwarf. The white dwarf produces lots of bright ultraviolet light that illuminates the nebula from the inside, as the expanding shell of gas absorbs the UV light and re-radiates it as visible light.
The Dumbbell Nebula, nicknamed for its dumbbell-like shape, appears as a small, faint patch of light about a quarter of the width of the full moon in binoculars or a small telescope. It lies within the Summer Triangle, a pattern of stars that’s easy to find overhead in the August sky. You’ll find the nebula about a third of the way between its bright stars Altair and Deneb.
Sky chart showing the Summer Triangle asterism, with the location of the Dumbbell Nebula (M27) indicated. NASA/JPL-Caltech Here’s hoping you get a chance to observe this glimpse into the future that awaits our Sun about 5 billion years from now. It’s part of a cycle that seeds the galaxy with the ingredients for new generations of stars and planets — perhaps even some not too different from our own.
Here are the phases of the Moon for August.
The phases of the Moon for August 2025. NASA/JPL-Caltech You can stay up to date on all of NASA’s missions exploring the solar system and beyond at science.nasa.gov. I’m Chelsea Gohd from NASA’s Jet Propulsion Laboratory, and that’s What’s Up for this month.
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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 NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
NASA/Lori Losey
The best way to solve a mystery is by gathering evidence and building a case. That’s exactly what NASA researchers are doing with a series of research flights aimed at advancing a sensor for supersonic parachutes. The clues they find could help make these parachutes more reliable and safer for delivering scientific instruments and payloads to Mars.
These investigative research flights are led by the EPIC (Enhancing Parachutes by Instrumenting the Canopy) team at NASA’s Armstrong Fight Research Center in Edwards, California. During a June flight test, a quadrotor aircraft, or drone, air-launched a capsule that deployed a parachute equipped with a sensor. The flexible, strain-measuring sensor attached to the parachute did not interfere with the canopy material, just as the EPIC team had predicted. The sensors also provided data, a bonus for planning upcoming tests.
“Reviewing the research flights will help inform our next steps,” said Matt Kearns, project manager for EPIC at NASA Armstrong. “We are speaking with potential partners to come up with a framework to obtain the data that they are interested in pursuing. Our team members are developing methods for temperature testing the flexible sensors, data analysis, and looking into instrumentation for future tests.”
The flight tests were a first step toward filling gaps in computer models to improve supersonic parachutes. This work could also open the door to future partnerships, including with the aerospace and auto racing industries.
NASA’s Space Technology Mission Directorate (STMD) funds the EPIC work through its Entry Systems Modeling project at NASA’s Ames Research Center in California’s Silicon Valley. The capsule and parachute system were developed by NASA’s Langley Research Center in Hampton, Virginia. NASA Armstrong interns worked with Langley to build and integrate a similar system for testing at NASA Armstrong. An earlier phase of the work focused on finding commercially available flexible strain sensors and developing a bonding method as part of an STMD Early Career Initiative project.
NASA researchers Paul Bean, center, and Mark Hagiwara, right, attach the capsule with parachute system to the Enhancing Parachutes by Instrumenting the Canopy test experiment on June 4, 2025, at NASA’s Armstong Flight Research Center in Edwards, California. NASA researchers are developing technology to make supersonic parachutes safer and more reliable for delivering science instruments and payloads to Mars.NASA/Christopher LC Clark Derek Abramson, left, and Justin Link, right, attach an Alta X drone to the Enhancing Parachutes by Instrumenting the Canopy test experiment on June 4, 2025, at NASA’s Armstong Flight Research Center in Edwards, California. Abramson is NASA chief engineer at the center’s Dale Reed Subscale Flight Research Laboratory, where Link also works as a pilot for small uncrewed aircraft systems. NASA researchers are developing technology to make supersonic parachutes safer and more reliable for delivering science instruments and payloads to Mars.NASA/Christopher LC Clark An Alta X drone is positioned at altitude for an air launch of the Enhancing Parachutes by Instrumenting the Canopy test experiment on June 4, 2025, at NASA’s Armstong Flight Research Center in Edwards, California. NASA researchers are developing technology to make supersonic parachutes safer and more reliable for delivering science instruments and payloads to Mars.NASA/Christopher LC Clark The parachute of the Enhancing Parachutes by Instrumenting the Canopy test experiment deploys following an air launch from an Alta X drone on June 4, 2025, at NASA’s Armstong Flight Research Center in Edwards, California. NASA researchers are developing technology to make supersonic parachutes safer and more reliable for delivering science instruments and payloads to Mars.NASA/Christopher LC Clark The Enhancing Parachutes by Instrumenting the Canopy project team examines a capsule and parachute following an air launch from an Alta X drone on June 4, 2025, at NASA’s Armstong Flight Research Center in Edwards, California. NASA researchers are developing technology to make supersonic parachutes safer and more reliable for delivering science instruments and payloads to Mars.NASA/Christopher LC Clark Share
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Last Updated Jul 29, 2025 EditorDede DiniusContactJay Levinejay.levine-1@nasa.gov Related Terms
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By NASA
The Indian Space Research Organisation’s Geosynchronous Satellite Launch Vehicle lifts off from Satish Dhawan Space Centre on India’s southeastern coast at 8:10 a.m. EDT (5:40 a.m. IST), July 30, 2025.Credit: ISRO Carrying an advanced radar system that will produce a dynamic, three-dimensional view of Earth in unprecedented detail, the NISAR (NASA-ISRO Synthetic Aperture Radar) satellite has launched from Satish Dhawan Space Centre in Sriharikota, Andhra Pradesh, India.
Jointly developed by NASA and the Indian Space Research Organisation (ISRO), and a critical part of the United States – India civil-space cooperation highlighted by President Trump and Prime Minister Modi earlier this year, the satellite can detect the movement of land and ice surfaces down to the centimeter. The mission will help protect communities by providing unique, actionable information to decision-makers in a diverse range of areas, including disaster response, infrastructure monitoring, and agricultural management.
The satellite lifted off aboard an ISRO Geosynchronous Satellite Launch Vehicle (GSLV) rocket at 8:10 a.m. EDT (5:10 p.m. IST), Wednesday, July 30. The ISRO ground controllers began communicating with NISAR about 20 minutes after launch, at just after 8:29 a.m. EDT, and confirmed it is operating as expected.
“Congratulations to the entire NISAR mission team on a successful launch that spanned across multiple time zones and continents in the first-ever partnership between NASA and ISRO on a mission of this sheer magnitude,” said Nicky Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington. “Where moments are most critical, NISAR’s data will help ensure the health and safety of those impacted on Earth, as well as the infrastructure that supports them, for the benefit of all.”
From 464 miles (747 kilometers) above Earth, NISAR will use two advanced radar instruments to track changes in Earth’s forests and wetland ecosystems, monitor deformation and motion of the planet’s frozen surfaces, and detect the movement of Earth’s crust down to fractions of an inch — a key measurement in understanding how the land surface moves before, during, and after earthquakes, volcanic eruptions, and landslides.
“ISRO’s GSLV has precisely injected NISAR satellite into the intended orbit, 747 kilometers. I am happy to inform that this is GSLV’s first mission to Sun-synchronous polar orbit. With this successful launch, we are at the threshold of fulfilling the immense scientific potential NASA and ISRO envisioned for the NISAR mission more than 10 years ago,” said ISRO Chairman V Narayanan. “The powerful capability of this radar mission will help us study Earth’s dynamic land and ice surfaces in greater detail than ever before.”
The mission’s two radars will monitor nearly all the planet’s land- and ice-covered surfaces twice every 12 days, including areas of the polar Southern Hemisphere rarely covered by other Earth-observing radar satellites. The data NISAR collects also can help researchers assess how forests, wetlands, agricultural areas, and permafrost change over time.
“Observations from NISAR will provide new knowledge and tangible benefits for communities both in the U.S. and around the world,” said Karen St. Germain, director, Earth Science division at NASA Headquarters. “This launch marks the beginning of a new way of seeing the surface of our planet so that we can understand and foresee natural disasters and other changes in our Earth system that affect lives and property.”
The NISAR satellite is the first free-flying space mission to feature two radar instruments — an L-band system and an S-band system. Each system is sensitive to features of different sizes and specializes in detecting certain attributes. The L-band radar excels at measuring soil moisture, forest biomass, and motion of land and ice surfaces, while S-band radar excels at monitoring agriculture, grassland ecosystems, and infrastructure movement.
Together, the radar instruments will enhance all of the satellite’s observations, making NISAR more capable than previous synthetic aperture radar missions. Unlike optical sensors, NISAR will be able to “see” through clouds, making it possible to monitor the surface during storms, as well as in darkness and light.
NASA’s Jet Propulsion Laboratory in Southern California provided the L-band radar, and ISRO’s Space Applications Centre in Ahmedabad developed the S-band radar. The NISAR mission marks the first time the two agencies have co-developed hardware for an Earth-observing mission.
“We’re proud of the international team behind this remarkable satellite. The mission’s measurements will be global but its applications deeply local, as people everywhere will use its data to plan for a resilient future,” said Dave Gallagher, director, NASA JPL, which manages the U.S. portion of the mission for NASA. “At its core is synthetic aperture radar, a technology pioneered at NASA JPL that enables us to study Earth night and day, through all kinds of weather.”
Including L-band and S-band radars on one satellite is an evolution in SAR airborne and space-based missions that, for NASA, started in 1978 with the launch of Seasat. In 2012, ISRO began launching SAR missions starting with Radar Imaging Satellite (RISAT-1), followed by RISAT-1A in 2022, to support a wide range of applications in India.
In the coming weeks, the spacecraft will begin a roughly 90-day commissioning phase during which it will deploy its 39-foot (12-meter) radar antenna reflector. This reflector will direct and receive microwave signals from the two radars. By interpreting the differences between the two, researchers can discern characteristics about the surface below. As NISAR passes over the same locations twice every 12 days, scientists can evaluate how those characteristics have changed over time to reveal new insights about Earth’s dynamic surfaces.
The NISAR mission is an equal collaboration between NASA and ISRO. Managed for the agency by Caltech, NASA JPL leads the U.S. component of the project and is providing the mission’s L-band SAR. NASA also is providing the radar reflector antenna, the deployable boom, a high-rate communication subsystem for science data, GPS receivers, a solid-state recorder, and payload data subsystem.
Space Applications Centre Ahmedabad, ISRO’s lead center for payload development, is providing the mission’s S-band SAR instrument and is responsible for its calibration, data processing, and development of science algorithms to address the scientific goals of the mission. U R Rao Satellite Centre in Bengaluru, which leads the ISRO components of the mission, is providing the spacecraft bus. The launch vehicle is from ISRO’s Vikram Sarabhai Space Centre, launch services are through ISRO’s Satish Dhawan Space Centre, and satellite operations are by ISRO Telemetry Tracking and Command Network. National Remote Sensing Centre in Hyderabad is responsible for S-band data reception, operational products generation, and dissemination.
To learn more about NISAR, visit:
https://nisar.jpl.nasa.gov
-end-
Karen Fox / Elizabeth Vlock
Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / elizabeth.a.vlock@nasa.gov
Andrew Wang / Jane J. Lee
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-354-0307
andrew.wang@jpl.nasa.gov / jane.j.lee@jpl.nasa.gov
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Last Updated Jul 30, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
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