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By NASA
Although NASA’s Lucy spacecraft’s upcoming encounter with the asteroid Donaldjohanson is primarily a mission rehearsal for later asteroid encounters, a new paper suggests that this small, main belt asteroid may have some surprises of its own. New modeling indicates that Donaldjohanson may have been formed about 150 million years ago when a larger parent asteroid broke apart; its orbit and spin properties have undergone significant evolution since.
This artist’s concept compares the approximate size of Lucy’s next asteroid target, Donaldjohanson, to the smallest main belt asteroids previously visited by spacecraft — Dinkinesh, visited by Lucy in November 2023, and Steins — as well as two recently explored near-Earth asteroids, Bennu and Ryugu. Credits: SwRI/ESA/OSIRIS/NASA/Goddard/Johns Hopkins APL/NOIRLab/University of Arizona/JAXA/University of Tokyo & Collaborators When the Lucy spacecraft flies by this approximately three-mile-wide space rock on April 20, 2025, the data collected could provide independent insights on such processes based on its shape, surface geology and cratering history.
“Based on ground-based observations, Donaldjohanson appears to be a peculiar object,” said Simone Marchi, deputy principal investigator for Lucy of Southwest Research Institute in Boulder, Colorado and lead author of the research published in The Planetary Science Journal. “Understanding the formation of Donaldjohanson could help explain its peculiarities.”
“Data indicates that it could be quite elongated and a slow rotator, possibly due to thermal torques that have slowed its spin over time,” added David Vokrouhlický, a professor at the Charles University, Prague, and co-author of the research.
Lucy’s target is a common type of asteroid, composed of silicate rocks and perhaps containing clays and organic matter. The new paper indicates that Donaldjohanson is a likely member of the Erigone collisional asteroid family, a group of asteroids on similar orbits that was created when a larger parent asteroid broke apart. The family originated in the inner main belt not very far from the source regions of the near-Earth asteroids Bennu and Ryugu, recently visited respectively by NASA’s OSIRIS-REx and JAXA’s (Japan Aerospace Exploration Agency’s) Hayabusa2 missions.
“We can hardly wait for the flyby because, as of now, Donaldjohanson’s characteristics appear very distinct from Bennu and Ryugu. Yet, we may uncover unexpected connections,” added Marchi.
“It’s exciting to put together what we’ve been able to glean about this asteroid,” said Keith Noll, Lucy project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “But Earth-based observing and theoretical models can only take us so far – to validate these models and get to the next level of detail we need close-up data. Lucy’s upcoming flyby will give us that.”
Donaldjohanson is named for the paleontologist who discovered Lucy, the fossilized skeleton of an early hominin found in Ethiopia in 1974, which is how the Lucy mission got its name. Just as the Lucy fossil provided unique insights into the origin of humanity, the Lucy mission promises to revolutionize our knowledge of the origin of humanity’s home world. Donaldjohanson is the only named asteroid so far to be visited while its namesake is still living.
“Lucy is an ambitious NASA mission, with plans to visit 11 asteroids in its 12-year mission to tour the Trojan asteroids that are located in two swarms leading and trailing Jupiter,” said SwRI’s Dr. Hal Levison, mission principal investigator at the Boulder, Colorado branch of Southwest Research Institute in San Antonio, Texas. “Encounters with main belt asteroids not only provide a close-up view of those bodies but also allow us to perform engineering tests of the spacecraft’s innovative navigation system before the main event to study the Trojans. These relics are effectively fossils of the planet formation process, holding vital clues to deciphering the history of our solar system.”
Lucy’s principal investigator is based out of the Boulder, Colorado, branch of Southwest Research Institute, headquartered in San Antonio. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, provides overall mission management, systems engineering, and safety and mission assurance. Lockheed Martin Space in Littleton, Colorado, built the spacecraft. Lucy is the 13th mission in NASA’s Discovery Program. NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the Discovery Program for the agency’s Science Mission Directorate in Washington.
By Deb Schmid and Katherine Kretke, Southwest Research Institute
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Nancy N. Jones
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Last Updated Mar 17, 2025 EditorMadison OlsonContactNancy N. Jonesnancy.n.jones@nasa.govLocationGoddard Space Flight Center Related Terms
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3 min read NASA’s Lucy Spacecraft Takes Its 1st Images of Asteroid Donaldjohanson
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By NASA
Earth (ESD) Earth Explore Explore Earth Science Climate Change Air Quality Science in Action Multimedia Image Collections Videos Data For Researchers About Us 8 Min Read NASA Researchers Study Coastal Wetlands, Champions of Carbon Capture
Florida’s coastal wetlands are a complex patchwork of ecosystem — consisting of sawgrass marshland, hardwood hammocks, freshwater swamps, and mangrove forests. Credits:
NASA/ Nathan Marder Across the street from the Flamingo Visitor’s Center at the foot of Florida’s Everglades National Park, there was once a thriving mangrove population — part of the largest stand of mangroves in the Western Hemisphere. Now, the skeletal remains of the trees form one of the Everglades’ largest ghost forests.
When Hurricane Irma made landfall in September 2017 as a category 4 storm, violent winds battered the shore and a storm surge swept across the coast, decimating large swaths of mangrove forest. Seven years later, most of the mangroves here haven’t seen any new growth. “At this point, I doubt they’ll recover,” said David Lagomasino, a professor of coastal studies at East Carolina University.
Lagomasino was in the Everglades conducting fieldwork as part of NASA’s BlueFlux Campaign, a three-year project that aims to study how sub-tropical wetlands influence atmospheric levels of carbon dioxide (CO2) and methane. Both gases absorb solar radiation and have a warming effect on Earth’s atmosphere.
A mangrove “ghost forest” near Florida’s southernmost coast houses the remains of a once-thriving mangrove stand. NASA/Nathan Marder The campaign is led by Ben Poulter, a researcher at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, who studies the way human activity and climate change affect the carbon cycle. As wetland vegetation responds to increasing temperatures, rising sea levels, and severe weather, Poulter’s team is trying to determine how much carbon dioxide wetland vegetation removes from the atmosphere and how much methane it produces. Ultimately this research will help scientists develop models to estimate and monitor greenhouse gas concentrations in coastal areas around the globe.
Although coastal wetlands account for less than 2% of the planet’s land-surface area, they remove a significant amount of carbon dioxide from the atmosphere. Florida’s coastal wetlands alone remove an estimated 31.8 million metric tons each year. A commercial aircraft would have to circle the globe more than 26,000 times to produce the same amount of carbon dioxide. Coastal wetlands also store carbon in marine sediments, keeping it underground — and out of the atmosphere — for thousands of years. This carbon storage capacity of oceans and wetlands is so robust that it has its own name: blue carbon.
“We’re worried about losing that stored carbon,” Poulter said. “But blue carbon also offers tremendous opportunities for climate mitigation if conservation and restoration are properly supported by science.”
The one-meter core samples collected by Lagomasino will be used to identify historic rates of blue carbon development in mangrove forests and to evaluate how rates of carbon storage respond to specific environmental pressures, like sea level rise or the increasing frequency of tropical cyclones.
Early findings from space-based flux data confirm that, in addition to acting as a sink of carbon dioxide, tropical wetlands are a significant source of methane — a greenhouse gas that traps heat roughly 80 times more efficiently than carbon dioxide. In fact, researchers estimate that Florida’s entire wetland expanse produces enough methane to offset the benefits of wetland carbon removal by about 5%.
Everglades peat contains history of captured carbon
During his most recent fieldwork deployment, Lagomasino used a small skiff to taxi from one research site to the next; many parts of the Everglades are virtually unreachable on foot. At each site, he opened a broad, black case and removed a metallic peat auger, which resembles a giant letter opener. The instrument is designed to extract core samples from soft soils. Everglades peat — which is composed almost entirely of the carbon-rich, partially decomposed roots, stems, and leaves of mangroves — offers a perfect study subject.
Lagomasino plunged the auger into the soil, using his body weight to push the instrument into the ground. Once the sample was secured, he freed the tool from the Earth, presenting a half-cylinder of soil. Each sample was sealed and shipped back to the lab — where they are sliced horizontally into flat discs and analyzed for their age and carbon content.
East Carolina University professor of coastal studies David Lagomasino (right) and his doctoral student Daystar Babanawo explore the Everglades by boat. The plant life here consists almost entirely of mangroves, which can withstand the saltwater tides that characterize coastal wetlands. Scientific studies of Florida’s coastal ecosystems have historically been limited by the relative inaccessibility of the region. NASA/Nathan Marder Everglades peat forms quickly. In Florida’s mangrove forests, around 2 to 10 millimeters of soil are added to the forest floor each year, building up over time like sand filling an hourglass. Much like an ice core, sediment cores offer a window into Earth’s past. The deeper the core, the further into the past one can see. By looking closely at the contents of the soil, researchers can uncover information about the climate conditions from the time the soil formed.
In some parts of the Everglades, soil deposits can reach depths of up to 3 meters (10 feet), where one meter might represent close to 100 years of peat accumulation, Lagomasino said. Deep in the Amazon rainforest, by comparison, a similarly sized, one-meter deposit could take more than 1,000 years to develop. This is important in the context of restoration efforts: in coastal wetlands, peat losses can be restored up to 10 times faster than they might be in other forest types.
Lagomasino holds a sample of peat soil collected from the forest floor. The source of the soil’s elevated carbon content — evident from its coarse, fibrous texture — is primarily the thread-like root hairs routinely recycled by the surrounding mangroves. The presence of water slows the decomposition of this organic material, which is why wetlands can lock carbon away and prevent it from escaping into the atmosphere for thousands of years. NASA/Nathan Marder “There are also significant differences in fluxes between healthy mangroves and degraded ones,” said Lola Fatoyinbo, a research scientist in the Biospheric Sciences Laboratory at NASA’s Goddard Space Flight Center. In areas where mangrove forests are suffering, for example, after a major hurricane, “you end up with more greenhouse gases in the atmosphere,” she said. As wetland ecology responds to intensifying natural and human pressures, the data product will help researchers precisely monitor the impact of ecological changes on global carbon dioxide and methane levels.
Wetland methane: A naturally occurring but potent greenhouse gas
Methane is naturally produced by microbes that live in wetland soils. But as wetland conditions change, the growth rate of methane-producing microbes can spike, releasing the gas into the atmosphere at prodigious rates.
Since methane is a significantly more potent greenhouse gas than carbon dioxide, possessing a warming potential 84 times greater over a 25-year period, methane emissions undermine some of the beneficial services that blue carbon ecosystems provide as natural sinks for atmospheric carbon dioxide.
While Lagomasino studied the soil to understand long-term storage of greenhouse gases, Lola Fatoyinbo, a research scientist in NASA’s Biospheric Sciences Lab, and Peter Raymond, an ecologist at Yale University’s School of the Environment, measured the rate at which these gases are exchanged between wetland vegetation and the atmosphere. This metric is known as gaseous flux.
Lagomasino holds a sample of peat soil collected from the forest floor. The presence of water slows the decomposition of this organic material, which is why wetlands can lock carbon away and prevent it from escaping into the atmosphere for thousands of years. NASA/Nathan Marder NASA/Nathan Marder The scientists measure flux using chambers designed to adhere neatly to points where significant rates of gas exchange occur. They secure box-like chambers to above-ground roots and branches while domed chambers measure gas escaping from the forest floor. The concentration of gases trapped in each chamber is measured over time.
In general, as the health of wetland ecology declines, less carbon dioxide is removed, and more methane is released. But the exact nature of the relationship between wetland health and gaseous flux is not well understood. What does flux look like in ghost forests, for example? And how do more subtle changes in variables like canopy coverage or species distribution influence levels of carbon dioxide sequestration or methane production?
“We’re especially interested in the methane part,” Fatoyinbo said. “It’s the least understood, and there’s a lot more of it than we previously thought.”
Based on data collected during BlueFlux fieldwork, “we’re finding that coastal wetlands remove massive amounts of carbon dioxide and produce substantial amounts of methane,” Poulter said. “But overall, these ecosystems appear to provide a net climate benefit, removing more greenhouse gases than they produce.” That could change as Florida’s wetlands respond to continued climate disturbances.
The future of South Florida’s ecology
Florida’s wetlands are roughly 5,000 years old. But in just the past century, more than half of the state’s original wetland coverage has been lost as vegetation was cleared and water was drained to accommodate the growing population. The Everglades system now contains 65% less peat and 77% less stored carbon than it did prior to drainage. The future of the ecosystem — which is not only an important reservoir for atmospheric carbon, but a source of drinking water for more than 7 million Floridians and a home to flora and fauna found nowhere else on Earth — is uncertain.
Scientists who have dedicated their careers to understanding and restoring South Florida’s ecology are hopeful. “Nature and people can coexist,” said Meenakshi Chabba, an ecologist and resilience scientist at the Everglades Foundation in Florida’s Miami-Dade County. “But we need good science and good management to reach that goal.”
The next step for NASA’s BlueFlux campaign is the development of a satellite-based data product that can help regional stakeholders evaluate in real-time how Florida’s wetlands are responding to restoration efforts designed to protect one of the state’s most precious natural resources — and all those who depend on it.
By Nathan Marder
NASA’s Goddard Space Flight Center, Greenbelt, Maryland
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Last Updated Mar 13, 2025 Editor Jenny Marder Contact Nathan Marder Related Terms
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By NASA
Before Apollo astronauts set foot upon the Moon, much remained unknown about the lunar surface. While most scientists believed the Moon had a solid surface that would support astronauts and their landing craft, a few believed a deep layer of dust covered it that would swallow any visitors. Until 1964, no closeup photographs of the lunar surface existed, only those obtained by Earth-based telescopes.
NASA’s Jet Propulsion Laboratory in Pasadena, California, managed the Ranger program, a series of spacecraft designed to return closeup images before impacting on the Moon’s surface. Ranger 7 first accomplished that goal in July 1964. On Feb. 17, 1965, its successor Ranger 8 launched toward the Moon, and three days later returned images of the Moon. The mission’s success helped the country meet President John F. Kennedy’s goal of a human Moon landing before the end of the decade.
Schematic diagram of the Ranger 8 spacecraft, showing its major components. NASA/JPL The television system aboard Ranger 8 showing its six cameras.NASA/JPL. Launch of Ranger 8. NASA. Ranger 8 lifted off from Cape Kennedy, now Cape Canaveral, Florida, on Feb. 17, 1965. The Atlas-Agena rocket first placed the spacecraft into Earth orbit before sending it on a lunar trajectory. The next day, the spacecraft carried out a mid-course correction, and on Feb. 20, Ranger 8 reached the Moon. The spacecraft’s six cameras turned on as planned, about eight minutes earlier than its predecessor to obtain images comparable in resolution to ground-based photographs for calibration purposes. Ranger 8 took its first photograph at an altitude of 1,560 miles, and during its final 23 minutes of flight, the spacecraft sent back 7,137 images of the lunar surface. The last image, taken at an altitude of 1,600 feet and 0.28 seconds before Ranger 8 impacted at 1.67 miles per second, had a resolution of about five feet. The spacecraft impacted 16 miles from its intended target in the Sea of Tranquility, ending a flight of 248,900 miles. Scientists had an interest in this area of the Moon as a possible landing zone for a future human landing, and indeed Apollo 11 landed 44 miles southeast of the Ranger 8 impact site in July 1969.
Ranger 8’s first image from an altitude of 1,560 miles.NASA/JPL. Ranger 8 image from an altitude of 198 miles, showing craters Ritter and Sabine.NASA/JPL. Ranger 8’s final images, taken at an altitude as low as 1,600 feet. NASA/JPL. One more Ranger mission followed, Ranger 9, in March 1965. Television networks broadcast Ranger 9’s images of the Alphonsus crater and the surrounding area “live” as the spacecraft approached its impact site in the crater – letting millions of Americans see the Moon up-close as it happened. Based on the photographs returned by the last three Rangers, scientists felt confident to move on to the next phase of robotic lunar exploration, the Surveyor series of soft landers. The Ranger photographs provided confidence that the lunar surface could support a soft-landing and that the Sea of Tranquility presented a good site for the first human landing. A little more than four years after the final Ranger images, Apollo 11 landed the first humans on the Moon.
Impact sites of Rangers 7, 8, and 9. NASA/JPL. The Ranger 8 impact crater, marked by the blue circle, photographed by Lunar Orbiter 2 in 1966.NASA/JPL. Lunar Reconnaissance Orbiter image of the Ranger 8 impact crater, taken in 2012 at a low sun angle.NASA/Goddard Space Flight Center/Arizona State University. The impacts of the Ranger probes left visible craters on the lunar surface, later photographed by orbiting spacecraft. Lunar Orbiter 2 and Apollo 16 both imaged the Ranger 8 impact site at relatively low resolution in 1966 and 1972, respectively. The Lunar Reconnaissance Orbiter imaged the crash site in greater detail in 2012.
Watch a brief video about the Ranger 8 impact on the Moon.
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By NASA
Explore Hubble Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights Science Behind Discoveries Hubble’s Partners in Science Universe Uncovered Explore the Night Sky Observatory Hubble Observatory Hubble Design Mission Operations Missions to Hubble Hubble vs Webb Team Hubble Team Career Aspirations Hubble Astronauts News Hubble News Hubble News Archive Social Media Media Resources Multimedia Multimedia Images Videos Sonifications Podcasts e-Books Online Activities Lithographs Fact Sheets Posters Hubble on the NASA App Glossary More 35th Anniversary Online Activities Hubble captured this image of supernova SN 2022abvt (the pinkish-white dot at image center) about two months after it was discovered in 2022. ESA/Hubble & NASA, R. J. Foley (UC Santa Cruz)
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A supernova and its host galaxy are the subject of this NASA/ESA Hubble Space Telescope image. The galaxy in question is LEDA 132905 in the constellation Sculptor. Even at more than 400 million light-years away, LEDA 132905’s spiral structure is faintly visible, as are patches of bright blue stars.
The bright pinkish-white dot in the center of the image, between the bright center of the galaxy and its faint left edge, is a supernova named SN 2022abvt. Discovered in late 2022, Hubble observed SN 2022abvt about two months later. This image uses data from a study of Type Ia supernovae, which occur when the exposed core of a dead star ignites in a sudden, destructive burst of nuclear fusion. Researchers are interested in this type of supernova because they can use them to measure precise distances to other galaxies.
The universe is a big place, and supernova explosions are fleeting. How is it possible to be in the right place at the right time to catch a supernova when it happens? Today, robotic telescopes that continuously scan the night sky discover most supernovae. The Asteroid Terrestrial-impact Last Alert System, or ATLAS, spotted SN 2022abvt. As the name suggests, ATLAS tracks down the faint, fast-moving signals from asteroids close to Earth. In addition to searching out asteroids, ATLAS also keeps tabs on objects that brighten or fade suddenly, like supernovae, variable stars, and galactic centers powered by hungry black holes.
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