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James Gentile: Shaping the Artemis Generation, One Simulation at a Time
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By NASA
Explore This Section Exoplanets Home Exoplanets Overview Exoplanets Facts Types of Exoplanets Stars What is the Universe Search for Life The Big Questions Are We Alone? Can We Find Life? The Habitable Zone Why We Search Target Star Catalog Discoveries Discoveries Dashboard How We Find and Characterize Missions People Exoplanet Catalog Immersive The Exoplaneteers Exoplanet Travel Bureau 5 Ways to Find a Planet Strange New Worlds Universe of Monsters Galaxy of Horrors News Stories Blog Resources Get Involved Glossary Eyes on Exoplanets Exoplanet Watch More Multimedia ExEP This artist’s concept pictures the planets orbiting Barnard’s Star, as seen from close to the surface of one of them. Image credit: International Gemini Observatory/NOIRLab/NSF/AURA/P. Marenfeld The Discovery
Four rocky planets much smaller than Earth orbit Barnard’s Star, the next closest to ours after the three-star Alpha Centauri system. Barnard’s is the nearest single star.
Key Facts
Barnard’s Star, six light-years away, is notorious among astronomers for a history of false planet detections. But with the help of high-precision technology, the latest discovery — a family of four — appears to be solidly confirmed. The tiny size of the planets is also remarkable: Capturing evidence of small worlds at great distance is a tall order, even using state-of-the-art instruments and observational techniques.
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Watching for wobbles in the light from a star is one of the leading methods for detecting exoplanets — planets orbiting other stars. This “radial velocity” technique tracks subtle shifts in the spectrum of starlight caused by the gravity of a planet pulling its star back and forth as the planet orbits. But tiny planets pose a major challenge: the smaller the planet, the smaller the pull. These four are each between about a fifth and a third as massive as Earth. Stars also are known to jitter and quake, creating background “noise” that potentially could swamp the comparatively quiet signals from smaller, orbiting worlds.
Astronomers measure the back-and-forth shifting of starlight in meters per second; in this case the radial velocity signals from all four planets amount to faint whispers — from 0.2 to 0.5 meters per second (a person walks at about 1 meter per second). But the noise from stellar activity is nearly 10 times larger at roughly 2 meters per second.
How to separate planet signals from stellar noise? The astronomers made detailed mathematical models of Barnard’s Star’s quakes and jitters, allowing them to recognize and remove those signals from the data collected from the star.
The new paper confirming the four tiny worlds — labeled b, c, d, and e — relies on data from MAROON-X, an “extreme precision” radial velocity instrument attached to the Gemini Telescope on the Maunakea mountaintop in Hawaii. It confirms the detection of the “b” planet, made with previous data from ESPRESSO, a radial velocity instrument attached to the Very Large Telescope in Chile. And the new work reveals three new sibling planets in the same system.
Fun Facts
These planets orbit their red-dwarf star much too closely to be habitable. The closest planet’s “year” lasts a little more than two days; for the farthest planet, it’s is just shy of seven days. That likely makes them too hot to support life. Yet their detection bodes well in the search for life beyond Earth. Scientists say small, rocky planets like ours are probably the best places to look for evidence of life as we know it. But so far they’ve been the most difficult to detect and characterize. High-precision radial velocity measurements, combined with more sharply focused techniques for extracting data, could open new windows into habitable, potentially life-bearing worlds.
Barnard’s star was discovered in 1916 by Edward Emerson Barnard, a pioneering astrophotographer.
The Discoverers
An international team of scientists led by Ritvik Basant of the University of Chicago published their paper on the discovery, “Four Sub-Earth Planets Orbiting Barnard’s Star from MAROON-X and ESPRESSO,” in the science journal, “The Astrophysical Journal Letters,” in March 2025. The planets were entered into the NASA Exoplanet Archive on March 13, 2025.
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Last Updated Apr 01, 2025 Related Terms
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4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The Crew Module Test Article (CMTA), a full scale mockup of the Orion spacecraft, is seen in the Pacific Ocean as teams practice Artemis recovery operations during Underway Recovery Test-12 onboard USS Somerset off the coast of California, Saturday, March 29, 2025. NASA/Bill Ingalls Preparations for NASA’s next Artemis flight recently took to the seas as a joint NASA and Department of Defense team, led by NASA’s Exploration Ground Systems Program, spent a week aboard the USS Somerset off the coast of California practicing procedures for recovering the Artemis II spacecraft and crew.
Following successful completion of Underway Recovery Test-12 (URT-12) on Monday, NASA’s Landing and Recovery team and their Defense Department counterparts are certified to recover the Orion spacecraft as part of the upcoming Artemis II test flight that will send NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, as well as CSA (Canadian Space Agency) astronaut Jeremy Hansen, on a 10-day journey around the Moon.
“This will be NASA’s first crewed mission to the Moon under the Artemis program,” said Lili Villarreal, the landing and recovery director for Artemis II. “A lot of practice led up to this week’s event, and seeing everything come together at sea gives me great confidence that the air, water, ground, and medical support teams are ready to safely recover the spacecraft and the crew for this historic mission.”
A wave breaks inside the well deck of USS Somerset as teams work to recover the Crew Module Test Article (CMTA), a full scale replica of the Orion spacecraft, as they practice Artemis recovery operations during Underway Recovery Test-12 off the coast of California, Thursday, March 27, 2025.NASA/Joel Kowsky Once Orion reenters Earth’s atmosphere, the capsule will keep the crew safe as it slows from nearly 25,000 mph to about 325 mph. Then its system of 11 parachutes will deploy in a precise sequence to slow the capsule and crew to a relatively gentle 20 mph for splashdown off the coast of California. From the time it enters Earth’s atmosphere, the Artemis II spacecraft will fly 1,775 nautical miles to its landing spot in the Pacific Ocean. This direct approach allows NASA to control the amount of time the spacecraft will spend in extremely high temperature ranges.
The Artemis II astronauts trained during URT-11 in February 2024, when they donned Orion Crew Survival System suits and practiced a range of recovery operations at sea using the Crew Module Test Article, a stand -in for their spacecraft.
For the 12th training exercise, NASA astronauts Deniz Burnham and Andre Douglas, along with ESA (European Space Agency) astronaut Luca Parmitano, did the same, moving from the simulated crew module to USS Somerset, with helicopters, a team of Navy divers in small boats, NASA’s open water lead – a technical expert and lead design engineer for all open water operations – as well as Navy and NASA medical teams rehearsing different recovery scenarios.
Grant Bruner, left, and Gary Kirkendall, right, Orion suit technicians, are seen with ESA (European Space Agency) astronaut Luca Parmitano, second from left, and NASA astronauts Deniz Burnham, center, and Andre Douglas, as they prepare to take part in Artemis recovery operations as part of Underway Recovery Test-12 onboard USS Somerset off the coast of California, Thursday, March 27, 2025. NASA/Joel Kowsky “Allowing astronauts to participate when they are not directly involved in a mission gives them valuable experience by exposing them to a lot of different scenarios,” said Glover, who will pilot Artemis II. “Learning about different systems and working with ground control teams also broadens their skillsets and prepares them for future roles. It also allows astronauts like me who are assigned to the mission to experience other roles – in this case, I am serving in the role of Joe Acaba, Chief of the Astronaut Office.”
NASA astronaut and Artemis II pilot Victor Glover, right, speaks to NASA astronauts Andre Douglas and Deniz Burnham as they prepare to take part in practicing Artemis recovery procedures during Underway Recovery Test-12 onboard USS Somerset off the coast of California, Friday, March 28, 2025.NASA/Joel Kowsky NASA astronaut Deniz Burnham smiles after landing in a Navy helicopter onboard USS Somerset during Underway Recovery Test-12 off the coast of California, Thursday, March 27, 2025.NASA/Bill Ingalls As the astronauts arrive safely at the ship for medical checkouts, recovery teams focus on returning the spacecraft and its auxiliary ground support hardware to the amphibious transport dock.
Navy divers attach a connection collar to the spacecraft and an additional line to a pneumatic winch inside the USS Somerset’s well deck, allowing joint NASA and Navy teams to tow Orion toward the ship. A team of sailors and NASA recovery personnel inside the ship manually pull some of the lines to help align Orion with its stand, which will secure the spacecraft for its trip to the shore. Following a safe and precise recovery, sailors will drain the well deck of water, and the ship will make its way back to Naval Base San Diego.
The Artemis II test flight will confirm the foundational systems and hardware needed for human deep space exploration, taking another step toward missions on the lunar surface and helping the agency prepare for human missions to Mars.
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Allison Tankersley
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Last Updated Mar 31, 2025 Related Terms
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By NASA
NASA/Frank Michaux Technicians from NASA and primary contractor Amentum join the SLS (Space Launch System) rocket with the stacked solid rocket boosters for the Artemis II mission at NASA’s Kennedy Space Center in Florida on March 23, 2025. The core stage is the largest component of the rocket, standing 212 feet tall and weighing about 219,000 pounds with its engines. The stage is the backbone of the rocket, supporting the launch vehicle stage adapter, interim cryogenic propulsion stage, Orion stage adapter, and the Orion spacecraft.
Artemis II is the first crewed test flight under NASA’s Artemis campaign and is another step toward missions on the lunar surface and helping the agency prepare for future human missions to Mars.
Image credit: NASA/Frank Michaux
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By NASA
Based at NASA’s Johnson Space Center in Houston, the Astromaterials Research and Exploration Science Division, or ARES, curates the most extensive collection of extraterrestrial materials on Earth, ranging from microscopic cosmic dust particles to Apollo-era Moon rocks. Soon, ARES’ team of world-leading sample scientists hopes to add something new to its collection – lunar samples from the Moon’s South Pole region.
As the Artemis campaign sample curation lead, Dr. Juliane Gross is helping ARES and NASA prepare to collect and return those samples safely. “I’m responsible for representing the voice of the Moon rocks and advocating for their protection, preservation, and maintaining their integrity during the planning and execution of all stages of the different Artemis sample return missions,” she said.
Juliane Gross leads a geology lesson for Artemis II crew members as part of their field training in Iceland in 2024.NASA Her multifaceted role includes preparing the Johnson facility that will receive new lunar samples, developing curation strategies, and collaborating with mission teams to plan sampling operations, which encompass collection, handling, transport, and storage processes for all stages of Artemis missions. She trains program managers and engineers on the importance of sample return and teaches crew members how to identify lunar samples and collect them without contamination. She also works with the different programs and teams that oversee the vehicles used at different stages of lunar missions – collaborating with the human landing system team around tool storage and delivery to the lunar surface, the Orion Program to coordinate sample stowage for the return to Earth, and Exploration Ground Systems to plan sample recovery after splashdown.
Once samples are returned to Earth, Gross and the ARES curation team will conduct a preliminary examination of the materials and release a sample catalog from which members of the global scientific community may request loans to carry out their respective research.
Working across Artemis teams raised an unexpected but fun challenge for Gross – learning to communicate effectively with colleagues who have different academic and professional backgrounds. “Scientists like me speak a different language than engineers, and we all speak a different language than managers or the general public,” she said. “I have worked hard to find common vocabulary and to ‘translate’ science needs into the different types of languages that exist within the Artemis campaign. I’m trying to use our differences as strengths to enable mission success and to connect and build relationships with all these different teams through my love and passion for the Moon and rocks from the Moon.”
That passion emerged shortly after Gross completed her Ph.D. in geology, while working on lunar samples with the Lunar and Planetary Institute. She went on to become a research scientist with the American Museum of Natural History in New York, and then a tenured professor of planetary sciences at Rutgers University in Piscataway, New Jersey.
In 2019, NASA asked Gross to join the Apollo Next Generation Sample Analysis Program. Under the program, NASA preserved some of the 382 kilograms of lunar samples returned by Apollo missions, keeping them sealed for future generations to open and analyze. “NASA had the foresight to understand that technology would evolve and our level of sophistication for handling and examining samples would greatly increase,” Gross said.
She and two other scientists had the incredible opportunity to open and examine two samples returned by Apollo 17. Their work served as a practice run for Artemis sample returns while building upon the fundamental insights into the shared origin and history of Earth and the Moon that scientists previously derived from other Apollo samples. For example, the team extracted gas from one sample that will provide information about the volatiles that future lunar missions may encounter around the Moon’s South Pole.
“The Apollo Next Generation Sample Analysis Program linked the first generation of lunar explorers from Apollo with future explorers of the Moon with Artemis,” Gross said. “I’m very proud to have played such an important role in this initiative that now feeds forward to Artemis.”
Juliane Gross examines lunar samples returned by Apollo 17 in Johnson Space Center’s Lunar Sample Laboratory Facility. NASA Gross’ connection with NASA began even earlier in her career. She was selected to join the agency-sponsored Antarctic Search for Meteorites team and lived in the deep ice fields of Antarctica for two months with seven other people. “We lived in tiny two-person tents without any support and recovered a total of 263 space rocks under challenging conditions,” she said. “I experienced the powerful forces of Antarctica and traveled 332 miles on skidoos. My body changed in the cold – I stuffed my face with enough butter, chocolate, and peanut M&Ms to last a lifetime and yet I lost weight.”
This formative experience taught Gross to find and celebrate beauty, even in her toughest moments. “I drank tea made with Antarctic glacier ice that is thousands to millions of years old. I will never forget the beautiful bell-like sounds that snow crystals make when being blown across the ice, the rainbow-sparkling ice crystals on a really cold day, the vast expanses of ice sheets looking like oceans frozen in eternity, and the icy bite of the wind on any unprotected skin that made me feel so alive and reminded me how vulnerable and precious life is,” she said. “And I will never ever forget the thrill and utter joy of finding a meteorite that you know no one on this planet has ever seen before you.”
Gross ultimately received the Antarctica Service Medal of the United States Armed Forces from the U.S. Department of Defense for her work.
Juliane Gross returns to McMurdo Station in Antarctica after working in the deep field for two months as part of the Antarctic Search for Meteorites team.Image courtesy of Juliane Gross Transitioning from full-time academia to her current position at NASA has been a big adjustment for Gross, but she has learned to love the change and the growth opportunities that come with it. “Being part of this incredible moment in history when we are about to return to the Moon with Artemis, our Apollo of today, feels so special and humbling that it made the transition easier,” she said.
The job has also increased Gross’ love and excitement for space exploration and reminds her every day why sample return missions are important. “The Moon is a museum of planetary history,” she said. “It has recorded and preserved the changes that affected the Earth-Moon system and is the best and most accessible place in the solar system to study planet-altering processes that have affected our corner of the universe.”
Still, “The Moon is only our next frontier,” she said. “Keep looking up and never give up. Ad astra!”
Watch below to learn about NASA’s rich history of geology training and hear how scientists and engineers are getting ready to bring back samples that will help us learn about the origins of our solar system.
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By NASA
6 Min Read NASA’s Webb Captures Neptune’s Auroras For First Time
At the left, an enhanced-color image of Neptune from NASA’s Hubble Space Telescope. At the right, that image is combined with data from NASA’s James Webb Space Telescope. Credits:
NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria University), Leigh Fletcher (University of Leicester), Stefanie Milam (NASA-GSFC) Long-sought auroral glow finally emerges under Webb’s powerful gaze
For the first time, NASA’s James Webb Space Telescope has captured bright auroral activity on Neptune. Auroras occur when energetic particles, often originating from the Sun, become trapped in a planet’s magnetic field and eventually strike the upper atmosphere. The energy released during these collisions creates the signature glow.
In the past, astronomers have seen tantalizing hints of auroral activity on Neptune, for example, in the flyby of NASA’s Voyager 2 in 1989. However, imaging and confirming the auroras on Neptune has long evaded astronomers despite successful detections on Jupiter, Saturn, and Uranus. Neptune was the missing piece of the puzzle when it came to detecting auroras on the giant planets of our solar system.
“Turns out, actually imaging the auroral activity on Neptune was only possible with Webb’s near-infrared sensitivity,” said lead author Henrik Melin of Northumbria University, who conducted the research while at the University of Leicester. “It was so stunning to not just see the auroras, but the detail and clarity of the signature really shocked me.”
The data was obtained in June 2023 using Webb’s Near-Infrared Spectrograph. In addition to the image of the planet, astronomers obtained a spectrum to characterize the composition and measure the temperature of the planet’s upper atmosphere (the ionosphere). For the first time, they found an extremely prominent emission line signifying the presence of the trihydrogen cation (H3+), which can be created in auroras. In the Webb images of Neptune, the glowing aurora appears as splotches represented in cyan.
Image A:
Neptune’s Auroras – Hubble and Webb
At the left, an enhanced-color image of Neptune from NASA’s Hubble Space Telescope. At the right, that image is combined with data from NASA’s James Webb Space Telescope. The cyan splotches, which represent auroral activity, and white clouds, are data from Webb’s Near-Infrared Spectrograph (NIRSpec), overlayed on top of the full image of the planet from Hubble’s Wide Field Camera 3. NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria University), Leigh Fletcher (University of Leicester), Stefanie Milam (NASA-GSFC) “H3+ has a been a clear signifier on all the gas giants — Jupiter, Saturn, and Uranus — of auroral activity, and we expected to see the same on Neptune as we investigated the planet over the years with the best ground-based facilities available,” explained Heidi Hammel of the Association of Universities for Research in Astronomy, Webb interdisciplinary scientist and leader of the Guaranteed Time Observation program for the Solar System in which the data were obtained. “Only with a machine like Webb have we finally gotten that confirmation.”
The auroral activity seen on Neptune is also noticeably different from what we are accustomed to seeing here on Earth, or even Jupiter or Saturn. Instead of being confined to the planet’s northern and southern poles, Neptune’s auroras are located at the planet’s geographic mid-latitudes — think where South America is located on Earth.
This is due to the strange nature of Neptune’s magnetic field, originally discovered by Voyager 2 in 1989 which is tilted by 47 degrees from the planet’s rotation axis. Since auroral activity is based where the magnetic fields converge into the planet’s atmosphere, Neptune’s auroras are far from its rotational poles.
The ground-breaking detection of Neptune’s auroras will help us understand how Neptune’s magnetic field interacts with particles that stream out from the Sun to the distant reaches of our solar system, a totally new window in ice giant atmospheric science.
From the Webb observations, the team also measured the temperature of the top of Neptune’s atmosphere for the first time since Voyager 2’s flyby. The results hint at why Neptune’s auroras remained hidden from astronomers for so long.
“I was astonished — Neptune’s upper atmosphere has cooled by several hundreds of degrees,” Melin said. “In fact, the temperature in 2023 was just over half of that in 1989.”
Through the years, astronomers have predicted the intensity of Neptune’s auroras based on the temperature recorded by Voyager 2. A substantially colder temperature would result in much fainter auroras. This cold temperature is likely the reason that Neptune’s auroras have remained undetected for so long. The dramatic cooling also suggests that this region of the atmosphere can change greatly even though the planet sits over 30 times farther from the Sun compared to Earth.
Equipped with these new findings, astronomers now hope to study Neptune with Webb over a full solar cycle, an 11-year period of activity driven by the Sun’s magnetic field. Results could provide insights into the origin of Neptune’s bizarre magnetic field, and even explain why it’s so tilted.
“As we look ahead and dream of future missions to Uranus and Neptune, we now know how important it will be to have instruments tuned to the wavelengths of infrared light to continue to study the auroras,” added Leigh Fletcher of Leicester University, co-author on the paper. “This observatory has finally opened the window onto this last, previously hidden ionosphere of the giant planets.”
These observations, led by Fletcher, were taken as part of Hammel’s Guaranteed Time Observation program 1249. The team’s results have been published in Nature Astronomy.
The James Webb Space Telescope is the world’s premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).
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Media Contacts
Laura Betz – laura.e.betz@nasa.gov
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Hannah Braun- hbraun@stsci.edu
Space Telescope Science Institute, Baltimore, Maryland
Christine Pulliam – cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
Science
Henrik Melin (Northumbria University)
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Last Updated Mar 25, 2025 Editor Stephen Sabia Contact Laura Betz laura.e.betz@nasa.gov Related Terms
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