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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Scientists believe giant impacts — like the one depicted in this artist’s concept — occurred on Mars 4.5 billion years ago, injecting debris from the impact deep into the planet’s mantle. NASA’s InSight lander detected this debris before the mission’s end in 2022.NASA/JPL-Caltech Rocky material that impacted Mars lies scattered in giant lumps throughout the planet’s mantle, offering clues about Mars’ interior and its ancient past.
What appear to be fragments from the aftermath of massive impacts on Mars that occurred 4.5 billion years ago have been detected deep below the planet’s surface. The discovery was made thanks to NASA’s now-retired InSight lander, which recorded the findings before the mission’s end in 2022. The ancient impacts released enough energy to melt continent-size swaths of the early crust and mantle into vast magma oceans, simultaneously injecting the impactor fragments and Martian debris deep into the planet’s interior.
There’s no way to tell exactly what struck Mars: The early solar system was filled with a range of different rocky objects that could have done so, including some so large they were effectively protoplanets. The remains of these impacts still exist in the form of lumps that are as large as 2.5 miles (4 kilometers) across and scattered throughout the Martian mantle. They offer a record preserved only on worlds like Mars, whose lack of tectonic plates has kept its interior from being churned up the way Earth’s is through a process known as convection.
A cutaway view of Mars in this artist’s concept (not to scale) reveals debris from ancient impacts scattered through the planet’s mantle. On the surface at left, a meteoroid impact sends seismic signals through the interior; at right is NASA’s InSight lander.NASA/JPL-Caltech The finding was reported Thursday, Aug. 28, in a study published by the journal Science.
“We’ve never seen the inside of a planet in such fine detail and clarity before,” said the paper’s lead author, Constantinos Charalambous of Imperial College London. “What we’re seeing is a mantle studded with ancient fragments. Their survival to this day tells us Mars’ mantle has evolved sluggishly over billions of years. On Earth, features like these may well have been largely erased.”
InSight, which was managed by NASA’s Jet Propulsion Laboratory in Southern California, placed the first seismometer on Mars’ surface in 2018. The extremely sensitive instrument recorded 1,319 marsquakes before the lander’s end of mission in 2022.
NASA’s InSight took this selfie in 2019 using a camera on its robotic arm. The lander also used its arm to deploy the mission’s seismometer, whose data was used in a 2025 study showing impacts left chunks of debris deep in the planet’s interior.NASA/JPL-Caltech Quakes produce seismic waves that change as they pass through different kinds of material, providing scientists a way to study the interior of a planetary body. To date, the InSight team has measured the size, depth, and composition of Mars’ crust, mantle, and core. This latest discovery regarding the mantle’s composition suggests how much is still waiting to be discovered within InSight’s data.
“We knew Mars was a time capsule bearing records of its early formation, but we didn’t anticipate just how clearly we’d be able to see with InSight,” said Tom Pike of Imperial College London, coauthor of the paper.
Quake hunting
Mars lacks the tectonic plates that produce the temblors many people in seismically active areas are familiar with. But there are two other types of quakes on Earth that also occur on Mars: those caused by rocks cracking under heat and pressure, and those caused by meteoroid impacts.
Of the two types, meteoroid impacts on Mars produce high-frequency seismic waves that travel from the crust deep into the planet’s mantle, according to a paper published earlier this year in Geophysical Research Letters. Located beneath the planet’s crust, the Martian mantle can be as much as 960 miles (1,550 kilometers) thick and is made of solid rock that can reach temperatures as high as 2,732 degrees Fahrenheit (1,500 degrees Celsius).
Scrambled signals
The new Science paper identifies eight marsquakes whose seismic waves contained strong, high-frequency energy that reached deep into the mantle, where their seismic waves were distinctly altered.
“When we first saw this in our quake data, we thought the slowdowns were happening in the Martian crust,” Pike said. “But then we noticed that the farther seismic waves travel through the mantle, the more these high-frequency signals were being delayed.”
Using planetwide computer simulations, the team saw that the slowing down and scrambling happened only when the signals passed through small, localized regions within the mantle. They also determined that these regions appear to be lumps of material with a different composition than the surrounding mantle.
With one riddle solved, the team focused on another: how those lumps got there.
Turning back the clock, they concluded that the lumps likely arrived as giant asteroids or other rocky material that struck Mars during the early solar system, generating those oceans of magma as they drove deep into the mantle, bringing with them fragments of crust and mantle.
Charalambous likens the pattern to shattered glass — a few large shards with many smaller fragments. The pattern is consistent with a large release of energy that scattered many fragments of material throughout the mantle. It also fits well with current thinking that in the early solar system, asteroids and other planetary bodies regularly bombarded the young planets.
On Earth, the crust and uppermost mantle is continuously recycled by plate tectonics pushing a plate’s edge into the hot interior, where, through convection, hotter, less-dense material rises and cooler, denser material sinks. Mars, by contrast, lacks tectonic plates, and its interior circulates far more sluggishly. The fact that such fine structures are still visible today, Charalambous said, “tells us Mars hasn’t undergone the vigorous churning that would have smoothed out these lumps.”
And in that way, Mars could point to what may be lurking beneath the surface of other rocky planets that lack plate tectonics, including Venus and Mercury.
More about InSight
JPL managed InSight for NASA’s Science Mission Directorate. InSight was part of NASA’s Discovery Program, managed by the agency’s Marshall Space Flight Center in Huntsville, Alabama. Lockheed Martin Space in Denver built the InSight spacecraft, including its cruise stage and lander, and supported spacecraft operations for the mission.
A number of European partners, including France’s Centre National d’Études Spatiales (CNES) and the German Aerospace Center (DLR), supported the InSight mission. CNES provided the Seismic Experiment for Interior Structure (SEIS) instrument to NASA, with the principal investigator at IPGP (Institut de Physique du Globe de Paris). Significant contributions for SEIS came from IPGP; the Max Planck Institute for Solar System Research (MPS) in Germany; the Swiss Federal Institute of Technology (ETH Zurich) in Switzerland; Imperial College London and Oxford University in the United Kingdom; and JPL. DLR provided the Heat Flow and Physical Properties Package (HP3) instrument, with significant contributions from the Space Research Center (CBK) of the Polish Academy of Sciences and Astronika in Poland. Spain’s Centro de Astrobiología (CAB) supplied the temperature and wind sensors.
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
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Last Updated Aug 28, 2025 Related Terms
InSight (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport) Jet Propulsion Laboratory Mars Explore More
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By NASA
This graphic features data from NASA’s Chandra X-ray Observatory of the Cassiopeia A (Cas A) supernova remnant that reveals that the star’s interior violently rearranged itself mere hours before it exploded. The main panel of this graphic is Chandra data that shows the location of different elements in the remains of the explosion: silicon (represented in red), sulfur (yellow), calcium (green) and iron (purple). The blue color reveals the highest-energy X-ray emission detected by Chandra in Cas A and an expanding blast wave. The inset reveals regions with wide ranges of relative abundances of silicon and neon. This data, plus computer modeling, reveal new insight into how massive stars like Cas A end their lives.X-ray: NASA/CXC/Meiji Univ./T. Sato et al.; Image Processing: NASA/CXC/SAO/N. Wolk The inside of a star turned on itself before it spectacularly exploded, according to a new study from NASA’s Chandra X-ray Observatory. Today, this shattered star, known as the Cassiopeia A supernova remnant, is one of the best-known, well-studied objects in the sky.
Over three hundred years ago, however, it was a giant star on the brink of self-destruction. The new Chandra study reveals that just hours before it exploded, the star’s interior violently rearranged itself. This last-minute shuffling of its stellar belly has profound implications for understanding how massive stars explode and how their remains behave afterwards.
Cassiopeia A (Cas A for short) was one of the first objects the telescope looked at after its launch in 1999, and astronomers have repeatedly returned to observe it.
“It seems like each time we closely look at Chandra data of Cas A, we learn something new and exciting,” said Toshiki Sato of Meiji University in Japan who led the study. “Now we’ve taken that invaluable X-ray data, combined it with powerful computer models, and found something extraordinary.”
As massive stars age, increasingly heavy elements form in their interiors by nuclear reactions, creating onion-like layers of different elements. Their outer layer is mostly made of hydrogen, followed by layers of helium, carbon and progressively heavier elements – extending all the way down to the center of the star.
Once iron starts forming in the core of the star, the game changes. As soon as the iron core grows beyond a certain mass (about 1.4 times the mass of the Sun), it can no longer support its own weight and collapses. The outer part of the star falls onto the collapsing core, and rebounds as a core-collapse supernova.
The new research with Chandra data reveals a change that happened deep within the star at the very last moments of its life. After more than a million years, Cas A underwent major changes in its final hours before exploding.
“Our research shows that just before the star in Cas A collapsed, part of an inner layer with large amounts of silicon traveled outwards and broke into a neighboring layer with lots of neon,” said co-author Kai Matsunaga of Kyoto University in Japan. “This is a violent event where the barrier between these two layers disappears.”
This upheaval not only caused material rich in silicon to travel outwards; it also forced material rich in neon to travel inwards. The team found clear traces of these outward silicon flows and inward neon flows in the remains of Cas A’s supernova remnant. Small regions rich in silicon but poor in neon are located near regions rich in neon and poor in silicon.
The survival of these regions not only provides critical evidence for the star’s upheaval, but also shows that complete mixing of the silicon and neon with other elements did not occur immediately before or after the explosion. This lack of mixing is predicted by detailed computer models of massive stars near the ends of their lives.
There are several significant implications for this inner turmoil inside of the doomed star. First, it may directly explain the lopsided rather than symmetrical shape of the Cas A remnant in three dimensions. Second, a lopsided explosion and debris field may have given a powerful kick to the remaining core of the star, now a neutron star, explaining the high observed speed of this object.
Finally, the strong turbulent flows created by the star’s internal changes may have promoted the development of the supernova blast wave, facilitating the star’s explosion.
“Perhaps the most important effect of this change in the star’s structure is that it may have helped trigger the explosion itself,” said co-author Hiroyuki Uchida, also of Kyoto University. “Such final internal activity of a star may change its fate—whether it will shine as a supernova or not.”
These results have been published in the latest issue of The Astrophysical Journal and are available online.
To learn more about Chandra, visit:
https://science.nasa.gov/chandra
Read more from NASA’s Chandra X-ray Observatory Learn more about the Chandra X-ray Observatory and its mission here:
https://www.nasa.gov/chandra
https://chandra.si.edu
Visual Description
This release features a composite image of Cassiopeia A, a donut-shaped supernova remnant located about 11,000 light-years from Earth. Included in the image is an inset closeup, which highlights a region with relative abundances of silicon and neon.
Over three hundred years ago, Cassiopeia A, or Cas A, was a star on the brink of self-destruction. In composition it resembled an onion with layers rich in different elements such as hydrogen, helium, carbon, silicon, sulfur, calcium, and neon, wrapped around an iron core. When that iron core grew beyond a certain mass, the star could no longer support its own weight. The outer layers fell into the collapsing core, then rebounded as a supernova. This explosion created the donut-like shape shown in the composite image. The shape is somewhat irregular, with the thinner quadrant of the donut to the upper left of the off-center hole.
In the body of the donut, the remains of the star’s elements create a mottled cloud of colors, marbled with red and blue veins. Here, sulfur is represented by yellow, calcium by green, and iron by purple. The red veins are silicon, and the blue veins, which also line the outer edge of the donut-shape, are the highest energy X-rays detected by Chandra and show the explosion’s blast wave.
The inset uses a different color code and highlights a colorful, mottled region at the thinner, upper left quadrant of Cas A. Here, rich pockets of silicon and neon are identified in the red and blue veins, respectively. New evidence from Chandra indicates that in the hours before the star’s collapse, part of a silicon-rich layer traveled outwards, and broke into a neighboring neon-rich layer. This violent breakdown of layers created strong turbulent flows and may have promoted the development of the supernova’s blast wave, facilitating the star’s explosion. Additionally, upheaval in the interior of the star may have produced a lopsided explosion, resulting in the irregular shape, with an off-center hole (and a thinner bite of donut!) at our upper left.
News Media Contact
Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
mwatzke@cfa.harvard.edu
Corinne Beckinger
Marshall Space Flight Center, Huntsville, Alabama
256-544-0034
corinne.m.beckinger@nasa.gov
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Last Updated Aug 28, 2025 EditorLee MohonContactCorinne M. Beckingercorinne.m.beckinger@nasa.govLocationMarshall Space Flight Center Related Terms
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By NASA
3 Min Read Inside NASA’s New Orion Mission Evaluation Room for Artemis II
As NASA’s Orion spacecraft is carrying crew around the Moon on the Artemis II mission, a team of expert engineers in the Mission Control Center at NASA’s Johnson Space Center in Houston will be meticulously monitoring the spacecraft along its journey. They’ll be operating from a new space in the mission control complex built to host the Orion Mission Evaluation Room (MER). Through the success of Orion and the Artemis missions, NASA will return humanity to the Moon and prepare to land an American on the surface of Mars.
Inside the Mission Evaluation Room, dozens of engineers will be monitoring the spacecraft and collecting data, while the flight control team located in mission control’s White Flight Control Room is simultaneously operating and sending commands to Orion during the flight. The flight control team will rely on the engineering expertise of the evaluation room to help with unexpected spacecraft behaviors that may arise during the mission and help analyze Orion’s performance data.
The new Orion Mission Evaluation Room inside the Mission Control Center at NASA’s Johnson Space Center in Houston.NASA/Rad Sinyak The Mission Evaluation Room team is made up of engineers from NASA, Lockheed Martin, ESA (European Space Agency), and Airbus who bring deep, expert knowledge of the spacecraft’s subsystems and functions to the mission. These functions are represented across 24 consoles, usually staffed by two engineers in their respective discipline, often hosting additional support personnel during planned dynamic phases of the mission or test objectives.
“The operations team is flying the spacecraft, but they are relying on the Mission Evaluation Room’s reachback engineering capability from the NASA, industry, and international Orion team that has designed, built, and tested this spacecraft.”
Trey PerrymAn
Lead for Orion Mission and Integration Systems at NASA Johnson
Perryman guides the Artemis II Orion mission evaluation room alongside Jen Madsen, deputy manager for Orion’s Avionics, Power, and Software.
With crew aboard, Orion will put more systems to the test, requiring more expertise to monitor new systems not previously flown. To support these needs, and safe, successful flights of Orion to the Moon, NASA officially opened the all-new facility in mission control to host the Orion Mission Evaluation Room on Aug. 15.
The Orion Mission Evaluation Room team works during an Artemis II mission simulation on Aug. 19, 2025, from the new space inside the Mission Control Center at NASA’s Johnson Space Center in Houston.NASA/Rad Sinyak During Artemis II, the evaluation room will operate in three daily shifts, beginning about 48 hours prior to liftoff. The room is staffed around the clock throughout the nearly 10 day mission, up until the spacecraft has been safely secured inside the U.S. Navy ship that will recover it after splashdown.
Another key function of the evaluation room is collecting and analyzing the large amount of data Orion will produce during the flight, which will help inform the room’s team on the spacecraft’s performance.
“Data collection is hugely significant,” Perryman said. “We’ll do an analysis and assessment of all the data we’ve collected, and compare it against what we were expecting from the spacecraft. While a lot of that data comparison will take place during the mission, we’ll also do deeper analysis after the mission is over to see what we learned.”
The Orion Mission Evaluation Room team works during an Artemis II mission simulation on Aug. 19, 2025, from the new space inside the Mission Control Center at NASA’s Johnson Space Center in Houston.NASA/Rad Sinyak If unplanned situations arise during the mission, the Mission Evaluation Room has additional layers of ability to support any specific need that presents itself. This includes various engineering support from different NASA centers, Lockheed Martin’s Integrated Test Lab, ESA’s European Space Research and Technology Center, and more.
“It’s been amazing to have helped design and build Orion from the beginning – and now, we’ll be able to see the culmination of all those years of work in this new Mission Evaluation Room."
Jen Madsen
Deputy Manager for Orion’s Avionics, Power, and Software
“We’ll see our spacecraft carrying our crew to the Moon on these screens and still be continuously learning about all of its capabilities,” said Madsen.
The Artemis II test flight will send NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, and CSA (Canadian Space Agency) astronaut Jeremy Hansen around the Moon and return them safely back home. This first crewed flight under NASA’s Artemis campaign will set the stage for NASA to return Americans to the lunar surface and help the agency and its commercial and international partners prepare for future human missions to Mars.
The Orion Mission Evaluation Room Team gathers for a group photo on Aug. 18, 2025.NASA/Josh Valcarcel Share
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Last Updated Aug 26, 2025 Related Terms
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By NASA
Think of NASA’s Stennis Space Center, and one likely thinks of rocket propulsion testing. The site has a long history of testing to support the nation’s space efforts, including the current Artemis program to send astronauts to the Moon to prepare for future human exploration of Mars.
However, NASA Stennis also is working to become a key supporter of more terrestrial exploration. Indeed, in terms of unmanned range operations, NASA Stennis has it all – layers of restricted airspace, a closed canal system, and acres upon acres of protected terrain.
Field TestU.S. Naval Research Laboratory personnel conduct a field experiment involving an unmanned aerial system at NASA Stennis in March 2024. (NASA/Danny Nowlin)NASA/Danny Nowlin Marine OperationU.S. Naval Research laboratory personnel conduct tests on The Blue Boat made by Blue Robotics, an unmanned surface vessel, at NOAA’s National Data Buoy Center basin at NASA Stennis on Dec. 19, 2024.NASA/Danny Nowlin Bird’s-Eye ViewAn unmanned aerial system provides a bird’s-eye view of an RS-25 on Feb. 22, 2024, on the Fred Haise Test Stand at NASA Stennis. NASA The NASA site near Bay St. Louis, Mississippi, is an ideal location for all types of air, marine, and ground testing, said Range Operations Manager Jason Peterson. “My job is to understand the customer, and their requirements and limitations, to help them succeed,” he added. “What makes NASA Stennis unique is our federally protected area for users to operate.”
The need to learn about unmanned systems, such as drones or underwater vehicles, in a safe environment is growing as technology advances. Think of it like learning to drive a car in a parking lot before hitting the road.
NASA Stennis has already begun leveraging these capabilities. In 2024, the center established an agreement with Skydweller Aero Inc. to utilize restricted airspace for flight testing of autonomous, solar-powered aircraft. This first-of-its-kind agreement paves the way for future collaborations as NASA Stennis expands its customer-based operations beyond onsite tenants.
An unmanned aerial system provides a panoramic view of the NASA Stennis test complex and canal system. NASA Look to the Sky
NASA Stennis has its own protected airspace, similar to how airports control the skies around them. The Federal Aviation Administration (FAA) first established this restricted airspace in 1966 and expanded it in 2016 to support both NASA missions and U.S. Department of Defense operations.
NASA Stennis is one of only two non-military restricted airspaces in the nation. It operates two main airspace zones – a propulsion testing area extending from ground level up to 12,000 feet for safely testing rocket engines without interfering with regular air traffic, and an aircraft operations zone covering 100 square miles up to 6,000 feet, with 15 dedicated acres for drone launch and recovery.
NASA Stennis staff provide comprehensive support including safety reviews, coordination between aircraft operators and FAA air traffic controllers, and constant communication with range safety personnel to ensure all operations are conducted safely.
Marine Operations
The centerpiece of the NASA Stennis marine range is its extensive 7.5-mile canal system, protected by a lock-and-dam system that connects to Pearl River tributaries. This network accommodates various marine platforms including traditional watercraft, autonomous underwater vehicles, remotely operated vehicles, unmanned surface vessels, and aerial drones requiring water landing capabilities.
The controlled environment provides protection from adverse weather and interference, making it ideal for testing sensitive or proprietary technologies. The facility is particularly valuable for emerging technologies in autonomous systems, sensor integration, and multi-domain operations where air, surface, and underwater platforms operate in coordination.
Ground Level
NASA Stennis facilities are located on 13,800 acres of fenced-in property, surrounded by an additional 125,000 acres of protected land known as the acoustical buffer zone. This area was established primarily through permanent lease to allow testing of large rocket hardware without disturbing area residents and is closely monitored without permanent habitable structures.
“The location helps reduce hazards to the public when testing new technology,” Peterson said. “With supporting infrastructure for office space, storage, or manufacturing, this makes NASA Stennis a great place to test, train, operate, and even manufacture.”
The NASA Stennis federal city already hosts more than 50 federal, state, academic, public, and private aerospace, technology, and research organizations, with room for more. All tenants share operating costs while pursuing individual missions.
‘Open for Business’
NASA Stennis leaders are keenly aware of the opportunity such unique capabilities afford. The center’s 2024-2028 strategic plan states NASA Stennis will leverage these unique capabilities to support testing and operation of uncrewed systems.
Leaders are working to identify opportunities to maximize site capabilities and develop an effective business model. “NASA Stennis is open for business, and we want to provide a user-friendly range for operators to test vehicles by creating an environment that is safe, cost-effective, and focused on mission success,” Peterson said.
For information about range operations at NASA’s Stennis Space Center, visit:
Range and Airspace Operations – NASA
For information about Stennis Space Center, visit:
https://www.nasa.gov/stennis
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Last Updated Aug 25, 2025 EditorNASA Stennis CommunicationsContactC. Lacy Thompsoncalvin.l.thompson@nasa.gov / (228) 688-3333LocationStennis Space Center Related Terms
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By NASA
Lockheed Martin Corporation NASA’s X-59 quiet supersonic research aircraft sits on the ramp at sunrise before ground tests at Lockheed Martin’s Skunk Works facility in Palmdale, California, on July 18, 2025. Following completion of low-speed taxi tests in July 2025 in Palmdale, California, medium- and high-speed taxi tests mark the final steps before the aircraft takes to the skies for the first time. The aircraft is scheduled to make its first flight later this year.
The X-59 is the centerpiece of NASA’s Quesst mission, which aims to demonstrate quiet supersonic flight by reducing the loud sonic boom to a quieter “thump.” Proving the X-plane’s airworthiness is the first step on the path to gathering data in support of the mission. The flight data will help inform U.S. and international regulators as they consider new noise standards for supersonic commercial flight over land.
Image Credit: Lockheed Martin Corporation
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