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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Located off the coast of Ecuador, Paramount seamount is among the kinds of ocean floor features that certain ocean-observing satellites like SWOT can detect by how their gravitational pull affects the sea surface.NOAA Okeanos Explorer Program More accurate maps based on data from the SWOT mission can improve underwater navigation and result in greater knowledge of how heat and life move around the world’s ocean.
There are better maps of the Moon’s surface than of the bottom of Earth’s ocean. Researchers have been working for decades to change that. As part of the ongoing effort, a NASA-supported team recently published one of the most detailed maps yet of the ocean floor, using data from the SWOT (Surface Water and Ocean Topography) satellite, a collaboration between NASA and the French space agency CNES (Centre National d’Études Spatiales).
Ships outfitted with sonar instruments can make direct, incredibly detailed measurements of the ocean floor. But to date, only about 25% of it has been surveyed in this way. To produce a global picture of the seafloor, researchers have relied on satellite data.
This animation shows seafloor features derived from SWOT data on regions off Mexico, South America, and the Antarctic Peninsula. Purple denotes regions that are lower relative to higher areas like seamounts, depicted in green. Eötvös is the unit of measure for the gravity-based data used to create these maps.
NASA’s Scientific Visualization Studio Why Seafloor Maps Matter
More accurate maps of the ocean floor are crucial for a range of seafaring activities, including navigation and laying underwater communications cables. “Seafloor mapping is key in both established and emerging economic opportunities, including rare-mineral seabed mining, optimizing shipping routes, hazard detection, and seabed warfare operations,” said Nadya Vinogradova Shiffer, head of physical oceanography programs at NASA Headquarters in Washington.
Accurate seafloor maps are also important for an improved understanding of deep-sea currents and tides, which affect life in the abyss, as well as geologic processes like plate tectonics. Underwater mountains called seamounts and other ocean floor features like their smaller cousins, abyssal hills, influence the movement of heat and nutrients in the deep sea and can attract life. The effects of these physical features can even be felt at the surface by the influence they exert on ecosystems that human communities depend on.
This map of seafloor features like abyssal hills in the Indian Ocean is based on sea surface height data from the SWOT satellite. Purple denotes regions that are lower relative to higher areas like abyssal hills, depicted in green. Eötvös is the unit of measure for the gravity-based data used to create these maps.NASA Earth Observatory This global map of seafloor features is based on ocean height data from the SWOT satellite. Purple denotes regions that are lower compared to higher features such as seamounts and abyssal hills, depicted in green. Eötvös is the unit of measure for the gravity-based data used to create these maps.NASA Earth Observatory This map of ocean floor features like seamounts southwest of Acapulco, Mexico, is based on sea surface height data from SWOT. Purple denotes regions that are lower relative to higher areas like seamounts, indicated with green. Eötvös is the unit of measure for the gravity-based data used to create these maps.NASA Earth Observatory Mapping the seafloor isn’t the SWOT mission’s primary purpose. Launched in December 2022, the satellite measures the height of water on nearly all of Earth’s surface, including the ocean, lakes, reservoirs, and rivers. Researchers can use these differences in height to create a kind of topographic map of the surface of fresh- and seawater. This data can then be used for tasks such as assessing changes in sea ice or tracking how floods progress down a river.
“The SWOT satellite was a huge jump in our ability to map the seafloor,” said David Sandwell, a geophysicist at Scripps Institution of Oceanography in La Jolla, California. He’s used satellite data to chart the bottom of the ocean since the 1990s and was one of the researchers responsible for the SWOT-based seafloor map, which was published in the journal Science in December 2024.
How It Works
The study authors relied the fact that because geologic features like seamounts and abyssal hills have more mass than their surroundings, they exert a slightly stronger gravitational pull that creates small, measurable bumps in the sea surface above them. These subtle gravity signatures help researchers predict the kind of seafloor feature that produced them.
Through repeated observations — SWOT covers about 90% of the globe every 21 days — the satellite is sensitive enough to pick up these minute differences, with centimeter-level accuracy, in sea surface height caused by the features below. Sandwell and his colleagues used a year’s worth of SWOT data to focus on seamounts, abyssal hills, and underwater continental margins, where continental crust meets oceanic crust.
Previous ocean-observing satellites have detected massive versions of these bottom features, such as seamounts over roughly 3,300 feet (1 kilometer) tall. The SWOT satellite can pick up seamounts less than half that height, potentially increasing the number of known seamounts from 44,000 to 100,000. These underwater mountains stick up into the water, influencing deep sea currents. This can concentrate nutrients along their slopes, attracting organisms and creating oases on what would otherwise be barren patches of seafloor.
Looking Into the Abyss
The improved view from SWOT also gives researchers more insight into the geologic history of the planet.
“Abyssal hills are the most abundant landform on Earth, covering about 70% of the ocean floor,” said Yao Yu, an oceanographer at Scripps Institution of Oceanography and lead author on the paper. “These hills are only a few kilometers wide, which makes them hard to observe from space. We were surprised that SWOT could see them so well.”
Abyssal hills form in parallel bands, like the ridges on a washboard, where tectonic plates spread apart. The orientation and extent of the bands can reveal how tectonic plates have moved over time. Abyssal hills also interact with tides and deep ocean currents in ways that researchers don’t fully understand yet.
The researchers have extracted nearly all the information on seafloor features they expected to find in the SWOT measurements. Now they’re focusing on refining their picture of the ocean floor by calculating the depth of the features they see. The work complements an effort by the international scientific community to map the entire seafloor using ship-based sonar by 2030. “We won’t get the full ship-based mapping done by then,” said Sandwell. “But SWOT will help us fill it in, getting us close to achieving the 2030 objective.”
More About SWOT
The SWOT satellite was jointly developed by NASA and CNES, with contributions from the Canadian Space Agency (CSA) and the UK Space Agency. NASA’s Jet Propulsion Laboratory, managed for the agency by Caltech in Pasadena, California, leads the U.S. component of the project. For the flight system payload, NASA provided the Ka-band radar interferometer (KaRIn) instrument, a GPS science receiver, a laser retroreflector, a two-beam microwave radiometer, and NASA instrument operations. The Doppler Orbitography and Radioposition Integrated by Satellite system, the dual frequency Poseidon altimeter (developed by Thales Alenia Space), the KaRIn radio-frequency subsystem (together with Thales Alenia Space and with support from the UK Space Agency), the satellite platform, and ground operations were provided by CNES. The KaRIn high-power transmitter assembly was provided by CSA.
To learn more about SWOT, visit:
https://swot.jpl.nasa.gov
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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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By NASA
James Gentile always wanted to fly. As he prepared for an appointment to the U.S. Air Force Academy to become a pilot, life threw him an unexpected curve: a diagnosis of Type 1 diabetes. His appointment was rescinded.
With his dream grounded, Gentile had two choices—give up or chart a new course. He chose the latter, pivoting to aerospace engineering. If he could not be a pilot, he would design the flight simulations that trained those who could.
Official portrait of James Gentile. NASA/Robert Markowitz As a human space vehicle simulation architect at NASA’s Johnson Space Center in Houston, Gentile leads the Integrated Simulation team, which supports the Crew Compartment Office within the Simulation and Graphics Branch. He oversees high-fidelity graphical simulations that support both engineering analysis and flight crew training for the Artemis campaign.
His team provides critical insight into human landing system vendor designs, ensuring compliance with NASA’s standards. They also develop human-in-the-loop simulations to familiarize teams with the challenges of returning humans to the lunar surface, optimizing design and safety for future space missions.
“I take great pride in what I have helped to build, knowing that some of the simulations I developed have influenced decisions for the Artemis campaign,” Gentile said.
One of the projects he is most proud of is the Human Landing System CrewCo Lander Simulation, which helps engineers and astronauts tackle the complexities of lunar descent, ascent, and rendezvous. He worked his way up from a developer to managing and leading the project, transforming a basic lunar lander simulation into a critical tool for the Artemis campaign.
What began as a simple model in 2020 is now a key training asset used in multiple facilities at Johnson. The simulation evaluates guidance systems and provides hands-on piloting experience for lunar landers.
James Gentile in the Simulation Exploration and Analysis Lab during a visit with Apollo 16 Lunar Module Pilot Charlie Duke. From left to right: Katie Tooher, Charlie Duke, Steve Carothers, Mark Updegrove, and James Gentile. NASA/James Blair Before joining Johnson as a contractor in 2018, Gentile worked in the aviation industry developing flight simulations for pilot training. Transitioning to the space sector was challenging at first, particularly working alongside seasoned professionals who had been part of the space program for years.
“I believe my experience in the private sector has benefited my career,” he said. “I’ve been able to bring a different perspective and approach to problem-solving that has helped me advance at Johnson.”
Gentile attributes his success to never being afraid to speak up and ask questions. “You don’t always have to be the smartest person in the room to make an impact,” he said. “I’ve been able to show my value through my work and by continuously teaching myself new skills.”
As he helps train the Artemis Generation, Gentile hopes to pass on his passion for aerospace and simulation development, inspiring others to persevere through obstacles and embrace unexpected opportunities.
“The most important lessons I’ve learned in my career are to build and maintain relationships with your coworkers and not to be afraid to step out of your comfort zone,” he said.
James Gentile with his son at NASA’s Johnson Space Center during the 2024 Bring Youth to Work Day. His journey did not go as planned, but in the end, it led him exactly where he was meant to be—helping humanity take its next giant leap.
“I’ve learned that the path to your goals may not always be clear-cut, but you should never give up on your dreams,” Gentile said.
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By NASA
Skywatching Science Skywatching The Next Full Moon is the Worm… Skywatching Home What’s Up What to See Tonight Moon Guide Eclipses Meteor Showers More Tips & Guides Skywatching FAQ 22 Min Read The Next Full Moon is the Worm Moon
Cockspur Island Lighthouse in Savannah, Georgia, on a full moon night in March 2019. Credits:
NPS/Joel Cadoff The next full moon is called the Worm Moon. Also, there will be a total lunar eclipse this full moon. The Moon will be full early Friday morning, March 14, at 2:55 a.m. EDT, but will appear full for about three days around this time, from Wednesday evening into Saturday morning.
The phases of the Moon for March 2025. As the Moon passes opposite the Sun it will move through the shadow of Earth creating a total eclipse of the Moon. The Moon will begin entering the partial shadow Thursday night at 11:57 p.m. EDT, but the gradual dimming of the Moon will not be noticeable until it starts to enter the full shadow Friday morning at 1:09 a.m. The round shadow of Earth will gradually shift across the face of the Moon (from lower left to upper right) until the Moon is fully shaded beginning at 2:26 a.m. The period of full shadow, or total eclipse, will last about 65 minutes, reaching the greatest eclipse at 2:59 a.m. and ending at 3:31 a.m. Even though it will be in full shadow, the Moon will still be visible. The glow of all of the sunrises and sunsets on Earth will give the Moon a reddish-brown hue, sometimes called a “Blood Moon” — although this name is also used for one of the full moons near the start of fall. From 3:31 a.m. until 4:48 a.m., the Moon will exit the full shadow of Earth, with the round shadow again shifting across the face of the Moon (from upper left to lower right). The Moon will leave the last of the partial shadow at 6 a.m. ending this eclipse.
The Maine Farmers’ Almanac began publishing Native American names for full moons in the 1930s, and these names are now widely known and used. According to this almanac, the tribes of the northeastern U.S. called the full moon in March the Crow, Crust, Sap, Sugar, or Worm Moon. The more northern tribes of the northeastern United States knew this as the Crow Moon, with the cawing of crows signaling the end of winter. Other northern names were the Crust Moon, because the snow cover became crusted from thawing by day and freezing by night, or the Sap (or Sugar) Moon as this was the time for tapping maple trees. The more southern tribes called this the Worm Moon after the earthworm casts that appeared as the ground thawed. It makes sense that only the southern tribes called this the Worm Moon. When glaciers covered the northern part of North America they wiped out the native earthworms. After these glaciers melted about 12,000 years ago the more northern forests grew back without earthworms. Most of the earthworms in these areas are invasive species introduced from Europe and Asia.
Continuing the tradition of naming moons after prominent phenomena tied to the time of year, a few years ago my friend Tom Van Wagner suggested naming this the Pothole Moon. It may be a case of confirmation bias, but whether in my car or on my bicycle I’ve noticed more potholes lately.
As usual, the wearing of suitably celebratory celestial attire is encouraged in honor of the full moon. Enjoy the total lunar eclipse (if you are in a part of the world that can see it), anticipate the coming of spring and watch out for potholes!
Gordon johnston
NASA Program Executive (Retired)
Here are the other celestial events between now and the full moon after next with times and angles based on the location of NASA Headquarters in Washington:
As winter in the Northern Hemisphere ends and spring begins, the daily periods of sunlight continue to lengthen, changing fastest around the vernal (spring) equinox on March 20. On Friday, March 14 (the day of the full moon), morning twilight will begin at 6:23 a.m. EDT, sunrise will be at 7:20 a.m., solar noon will be at 1:17 p.m. when the Sun will reach its maximum altitude of 48.9 degrees, sunset will be at 7:14 p.m., and evening twilight will end at 8:12 p.m. By Saturday, April 12 — the day of the full moon after next — morning twilight will begin at 5:36 a.m., sunrise will be at 6:36 a.m., solar noon will be at 1:09 p.m. when the Sun will reach its maximum altitude of 60.1 degrees, sunset will be at 7:43 p.m., and evening twilight will end at 8:43 p.m.
During this lunar cycle, a backyard telescope should still provide interesting views of Jupiter and Mars high in the evening sky. Venus and Mercury will only be visible near the start at this cycle and will be too low to see easily unless you have access to a location with clear views toward the western horizon. With a telescope, you should be able to see Jupiter’s four bright moons, Ganymede, Callisto, Europa, and Io, noticeably shifting positions in the course of an evening. Jupiter was at its closest and brightest in early December. Mars was at its closest and brightest for the year just a month ago. The planet Uranus will be too dim to see without a telescope when the Moon is in the sky, but later in the lunar cycle, if you are in a very dark area with clear skies and no interference from moonlight, it will still be brighter than the faintest visible stars, making it barely visible. Uranus was at its closest and brightest in mid-November.
Comets and Meteor Shower
No meteor showers are predicted to peak during this lunar cycle, and no comets are expected to be visible without a telescope.
Evening Sky Highlights
On the evening of Thursday, March 13 — the night of the full moon — as twilight ends at 8:11 p.m. EDT, the rising Moon will be 14 degrees above the eastern horizon. The brightest planet in the sky will be Venus at 4 degrees above the west-southwestern horizon, appearing as a thin, 4% illuminated crescent through a telescope. Next in brightness will be Jupiter at 62 degrees above the west-southwestern horizon. Third in brightness will be Mars at 72 degrees above the southeastern horizon. Mercury, to the left of Venus, will also be 4 degrees above the western horizon. Uranus, on the edge of what is visible under extremely clear, moonless, and dark skies, will be 45 degrees above the western horizon. The bright star closest to overhead will be Capella at 75 degrees above the northwestern horizon. Capella is the 6th brightest star in our night sky, and the brightest star in the constellation Auriga (shaped like a charioteer). Although we see Capella as a single star it is actually four stars — two pairs of stars orbiting each other. Capella is about 43 light-years from Earth.
Also high in the sky will be the constellation Orion, easily identifiable because of the three stars that form Orion’s Belt. This time of year, we see many bright stars at evening twilight, with bright stars scattered from the south-southeast toward the northwest. We see more stars in this direction because we are looking toward the Local Arm of our home galaxy (also called the Orion Arm, Orion-Cygnus Arm, or Orion Bridge). This arm is about 3,500 light years across and 10,000 light years long. Some of the bright stars we see from this arm are the three stars of Orion’s Belt, along with Rigel (860 light-years from Earth), Betelgeuse (548 light-years), Polaris (about 400 light-years), and Deneb (about 2,600 light-years).
As this lunar cycle progresses, the background of stars will rotate by about a degree westward each evening around the pole star Polaris. March 16 will be the last evening Venus will be above the horizon, and March 17 will be the last evening Mercury will be above the horizon as twilight ends. On March 30, Mars will pass by the bright star Pollux for the third time in 6 months, having passed by in mid-October 2024, changed direction (called apparent retrograde motion) and passed again in mid-January, then changed directions again for this March 30 pass. The waxing moon will appear near the Pleiades star cluster on April 1, Jupiter on April 2, Mars and Pollux on April 5, and Regulus on April 7 and 8.
By the evening of Saturday, April 12 — the evening of the night of the full moon after next — as twilight ends at 8:43 p.m. EDT, the rising Moon will be 10 degrees above the east-southeastern horizon with the bright star Spica about a half degree to the upper left. The brightest planet in the sky will be Jupiter at 38 degrees above the western horizon. Next in brightness will be Mars at 70 degrees above the southwestern horizon. Uranus, on the edge of what is visible under extremely clear, moonless dark skies, will be 18 degrees above the western horizon. The bright star closest to overhead will be Pollux at 71 degrees above the west-southwestern horizon. Pollux is the 17th brightest star in our night sky and the brighter of the twin stars in the constellation Gemini the twins. It is an orange-tinted star about 34 light-years from Earth. Pollux is not quite twice the mass of our Sun, but is about 9 times the diameter and 33 times the brightness.
Morning Sky Highlights
On the morning of Friday, March 14 — the morning of the full moon — as twilight begins at 6:23 a.m. EDT, the setting full moon will be 12 degrees above the western horizon. No visible planets will appear in the sky. The bright star closest to overhead will be Vega at 68 degrees above the eastern horizon. Vega is the 5th brightest star in our night sky and the brightest star in the constellation Lyra (the lyre). Vega is one of the three bright stars of the “Summer Triangle” along with Deneb and Altair. It is about 25 light-years from Earth, has twice the mass of our Sun, and shines 40 times brighter than our Sun.
As this lunar cycle progresses, the background of stars will rotate westward by about a degree each morning around the pole star Polaris. The waning moon will appear near Spica on March 16 and 17, and Antares on March 20. Bright Venus — now the morning star — will begin to emerge from the glow of dawn around March 21 and will be above the horizon as twilight begins after March 29. Mercury and Saturn will begin emerging from the glow of dawn in early April, rising after morning twilight begins. Initially Saturn will appear brighter than Mercury, but Mercury will brighten each morning as it becomes a fuller crescent, showing more illuminated area to Earth. After about April 8, Mercury will appear brighter than Saturn.
By the morning of Sunday, April 13 — the morning of the night of the full moon after next — as twilight begins at 5:34 a.m. EDT, the setting full moon will be 10 degrees above the west-southwestern horizon with the bright star Spica 4 degrees to the right. The only planet in the sky as twilight begins will be bright Venus as the morning star at 5 degrees above the eastern horizon. However, both Mercury and the fainter Saturn should be visible below Venus after they rise 4 and 7 minutes later (Saturn at 5:37 a.m. and Mercury at 5:40 a.m.). The bright star closest to overhead still will be Vega at 81 degrees above the eastern horizon.
Detailed Daily Guide
Here for your reference is a day-by-day listing of celestial events between now and the full moon on April 12, 2025. The times and angles are based on the location of NASA Headquarters in Washington, and some of these details may differ for where you are (I use parentheses to indicate times specific to the D.C. area). If your latitude is significantly different than 39 degrees north (and especially for my Southern Hemisphere readers), I recommend using an astronomy app that is set up for your location or a star-watching guide from a local observatory, news outlet, or astronomy club.
March 8 Just after midnight on Saturday morning, March 8, the planet Mercury will reach its greatest angular separation from the Sun as seen from Earth for this apparition (called greatest elongation).
Saturday evening, March 8, Mercury will appear at its highest (6 degrees) above the western horizon as evening twilight ends (at 7:06 p.m. EST). Mercury will set 34 minutes later (at 7:40 p.m.). This will also be the evening Mercury will have dimmed to the brightness of Mars, after which Mars will be the third brightest visible planet again.
March 8 – 9 On Saturday evening into Sunday morning, March 8 to 9, Mars will appear near the waxing gibbous moon with the bright star Pollux (the brighter of the twin stars in the constellation Gemini) nearby. As evening twilight ends at 7:06 p.m. EST, Mars will be 1.5 degrees to the lower right of the Moon and Pollux will be 6 degrees to the lower left. As the Moon reaches its highest for the night more than an hour later at 8:22 p.m., Mars will be 1.5 degrees to the lower right of the Moon and Pollux will be 5.5 degrees to the upper left. By the time Mars sets on the northwestern horizon (at 4:53 a.m.) it will be 4 degrees to the lower left of the Moon and Pollux will be 3 degrees above the Moon.
March 9 Don’t forget to reset your clocks (if they don’t automatically set themselves) as we “spring forward” to Daylight Saving Time! For much of the U.S., 2 to 3 a.m. on March 9, 2025, might be a good hour for magical or fictional events (as it doesn’t actually exist).
March 11 – 12 Tuesday evening into Wednesday morning, March 11 to 12, the bright star Regulus will appear near the nearly full moon. As evening twilight ends at 8:09 p.m. EDT, Regulus will be 4 degrees to the lower right of the Moon. When the Moon reaches its highest for the night at 11:52 p.m., Regulus will be 3 degrees to the lower right. By the time morning twilight begins at 6:26 a.m., Regulus will be about one degree below the Moon.
Wednesday morning, March 12, Saturn will be passing on the far side of the Sun as seen from Earth, called conjunction. Because Saturn orbits outside of the orbit of Earth it will be shifting from the evening sky to the morning sky. Saturn will begin emerging from the glow of dawn on the eastern horizon in early April (depending upon viewing conditions).
Wednesday evening, March 12, will be when Venus and Mercury will appear closest to each other low on the western horizon, 5.5 degrees apart. They will be about 5 degrees above the horizon as evening twilight ends at 8:10 p.m. EDT, and Mercury will set first 27 minutes later at 8:37 p.m.
March 14 As mentioned above, the full moon will be early Friday morning, March 14, at 2:55 a.m. EDT. There will be a total eclipse of the Moon. As the Moon passes opposite the Sun it will move through the shadow of Earth. The Moon will begin entering the partial shadow Thursday night at 11:57 p.m., but the gradual dimming of the Moon will not be noticeable until it starts to enter the full shadow Friday morning at 1:09 a.m. The round shadow of Earth will gradually shift across the face of the Moon (from lower left to upper right) until the Moon is fully shaded beginning at 2:26 a.m. The period of full shadow or total eclipse will last about 65 minutes, reaching the greatest eclipse at 2:59 a.m. and ending at 3:31 a.m. Even though it will be in full shadow, the Moon will still be visible. The glow of all of the sunrises and sunsets on Earth will give the Moon a reddish-brown hue, sometimes called a “Blood Moon” — although this name is also used for one of the full moons near the start of fall. From 3:31 a.m. until 4:48 a.m. the Moon will exit the full shadow of Earth, with the round shadow of Earth again shifting across the face of the Moon (from upper left to lower right). The Moon will leave the last of the partial shadow at 6 a.m., ending this eclipse. This full moon will be on Thursday evening from Pacific Daylight Time and Mountain Standard Time westward to the International Date Line in the mid Pacific. The Moon will appear full for about three days around this time, from Wednesday evening into Saturday morning.
March 16 Sunday morning, March 16, the bright star Spica will appear near the waning gibbous moon. As the Moon reaches its highest at 2:34 a.m. EDT, Spica will be 6.5 degrees to the lower left. As morning twilight begins at 6:20 a.m. Spica will be 5 degrees to the upper left.
During the day on Sunday, March 16, for parts of Eastern Africa, the southern tip of the Arabian Peninsula, the Indian Ocean, and the southern tip of Western Australia, the Moon will pass in front of Spica.
Sunday evening, March 16, will be the last evening that Venus will be above the west-northwestern horizon as evening twilight ends at 8:14 p.m. EDT, with Venus setting 1 minute later.
March 16 – 17 Sunday night into Monday morning, March 16 to 17, the waning gibbous moon will have shifted to the other side of the bright star Spica. As the Moon rises on the east-southeastern horizon at 9:49 p.m. EDT, Spica will be 4 degrees above the Moon. By the time the Moon reaches its highest at 3:15 a.m., Spica will be 6.5 degrees to the upper right. As morning twilight begins at 6:18 a.m., Spica will be 7.5 degrees to the right of the Moon.
Monday midday, March 17, at 12:27 p.m. EDT, the Moon will be at apogee, its farthest from Earth for this orbit.
Monday evening, March 17, will be the last evening that Mercury will be above the western horizon as evening twilight ends at 8:15 p.m. EDT, with Mercury setting 3 minutes later.
March 19 Wednesday evening, March 19, Neptune will be passing on the far side of the Sun as seen from Earth, called conjunction. Because it orbits outside of the orbit of Earth, Neptune will be shifting from the evening sky to the morning sky. Neptune is faint enough that it is only visible with a telescope.
March 20 Thursday morning, March 20, the bright star Antares will appear near the waning gibbous moon. As Antares rises on the southeastern horizon at 1:17 a.m. EDT, it will be 5 degrees to the lower left of the Moon. By the time the Moon reaches its highest for the night at 5:31 a.m., Antares will be 3.5 degrees to the left of the Moon. Morning twilight will begin 42 minutes later at 6:13 a.m. For parts of Australia and New Zealand the Moon will pass in front of Antares.
Thursday morning at 5:01 a.m. EDT will be the vernal equinox, the astronomical end of winter and start of spring.
March 21 Starting around Friday morning, March 21, Venus as the morning star will begin to emerge from the glow of dawn, rising on the east-northeastern horizon more than 30 minutes before sunrise. Interestingly, this is just before inferior conjunction, when Venus passes “between” Earth and the Sun (passing through the same ecliptic longitude as the Sun as seen from Earth).
March 22 Saturday morning, March 22, the waning moon will appear half-full as it reaches its last quarter at 7:29 a.m. EDT.
Saturday night, Venus will be passing through the same ecliptic longitude as the Sun as seen from Earth, called inferior conjunction. Planets that orbit inside of the orbit of Earth can have two types of conjunctions with the Sun, inferior (when passing between Earth and Sun) and superior (when passing on the far side of the Sun as seen from Earth). Venus will be shifting from the evening sky to the morning sky but will be passing far enough away from the Sun that it may have already begun to be visible in the glow of dawn on the east-northeastern horizon (depending upon viewing conditions).
March 24 Monday afternoon, March 24, Mercury will be passing between Earth and Sun as seen from Earth, called inferior conjunction. It also will be shifting from the evening sky to the morning sky and will begin emerging from the glow of dawn on the eastern horizon in early April (depending upon viewing conditions).
March 29 Saturday morning, March 29, will be the first morning that Venus as the morning star will be above the horizon as twilight begins at 5:59 a.m. EDT.
Saturday morning, March 29, at 6:58 a.m. EDT, will be the new moon, when the Moon passes between Earth and the Sun and is usually not visible from Earth. However, for parts of northwestern Africa, northwestern Eurasia, and northeastern North America, part of the silhouette of the Moon will be visible as it passes in front of the Sun in a partial solar eclipse. The viewing from the Washington area will not be very good. As the Sun rises on the eastern horizon at 6:57 a.m., the Moon will be blocking a small sliver of the left side of the Sun, with the eclipse ending 5 minutes later at 7:02 a.m.
March 30 Early Sunday morning, March 30, at 1:19 a.m. EDT, the Moon will be at perigee, its closest to Earth for this orbit.
For the third time since mid-October 2024, Mars will be passing by the bright star Pollux, the brighter of the twin stars in the constellation Gemini (the twins). Planets that orbit farther from the Sun than Earth’s orbit usually appear to shift westward each night, like the stars, but more slowly, so that they shift eastward relative to the stars. This is because the planets all move in the same direction around the Sun. But around the time when an outer planet is closest to Earth it appears to move the other direction, shifting westward relative to the stars, called apparent retrograde motion. This tendency to “wander” relative to the stars is where the word “planet” comes from (based on the Greek word for “wanderer”). In mid-October 2024 Mars passed by Pollux for the first time as it moved eastward relative to the stars. Beginning Dec. 6, 2024, Mars started its retrograde motion. On Jan. 15, 2025, Mars was at its closest and brightest for the year. On January 23 Mars passed by Pollux for the second time, just 2.5 degrees apart, this time shifting westward relative to the stars. Mars ended its retrograde motion on February 23. It is now shifting eastward again relative to the stars and will pass Pollux a third time on March 30, this time 4 degrees apart. Mars and Pollux will be nearly overhead as evening twilight ends at 8:29 p.m. EDT. Mars will set first on the west-northwestern horizon the morning of March 31 at 3:43 a.m.
This also is the first morning that Mercury will be above the eastern horizon 30 minutes before sunrise. Mercury will be relatively dim, as it will only present a narrow crescent toward Earth. It will brighten significantly each morning, but it’s difficult to predict when it will be bright enough to see in the glow of dawn.
April 1 Tuesday morning, April 1, will be the first morning that Saturn will be above the eastern horizon 30 minutes before sunrise, a rough approximation of when it might start being visible in the glow of dawn.
Tuesday evening, the Pleiades star cluster will appear 1.5 degrees below the waxing crescent moon. The Moon will be 36 degrees above the western horizon as evening twilight ends at 8:31 p.m. EDT, and the Pleiades will set first on the west-northwestern horizon 3 hours later at about 11:40 p.m.
April 2 Wednesday evening, April 2, Jupiter will appear 5.5 degrees to the lower left of the waxing crescent moon. The Moon will be 49 degrees above the western horizon as evening twilight ends at 8:32 p.m. EDT. Jupiter will set first on the west-northwestern horizon 4 hours later Thursday morning at 12:43 a.m.
April 4 Friday night, April 4, the Moon will appear half-full as it reaches its first quarter at 10:15 p.m. EDT.
April 5 – 6 Saturday night into Sunday morning, April 5 to 6, the waxing gibbous moon, Mars, and the bright star Pollux will appear to form a triangle. As evening twilight ends at 8:35 p.m. EDT, Mars will be 3 degrees to the lower right and Pollux 5 degrees to the upper right. As the night progresses, Mars and Pollux will appear to rotate clockwise and away from the Moon. As Mars sets first on the west-northwestern horizon 7 hours later at 3:26 a.m. it will be 6 degrees to the lower right, with Pollux 8.5 degrees to the right of the Moon.
April 7 – 8 Monday night into Tuesday morning, April 7 to 8, the bright star Regulus will appear near the waxing gibbous moon. As evening twilight ends at 8:37 p.m. EDT, Regulus will be 7 degrees below the Moon. As the Moon reaches its highest in the sky at 9:51 p.m., Regulus will be 6.5 degrees to the lower left. By the time Regulus and the Moon set together on the west-northwestern horizon at 4:52 a.m., Regulus will be 3.5 degrees to the left of the Moon.
Tuesday morning, April 8, will be when Mercury will become as bright as Saturn in the glow of dawn (with both Mercury and Saturn rising after morning twilight begins). After this, Mercury will continue brightening each morning as more of its sunlit crescent faces Earth.
April 8 – 9 Tuesday night into Wednesday morning, April 8 to 9, the waxing gibbous moon will have shifted to the other side of the bright star Regulus. As evening twilight ends at 8:38 p.m. EDT, Regulus will be 6 degrees to the upper right of the Moon. As the Moon reaches its highest in the sky at 10:34 p.m., Regulus will be 7 degrees to the right. The pair will continue to separate as the night progresses.
April 10 Thursday morning, April 10, the planets Mercury and Saturn will appear nearest each other, 2 degrees apart, in the glow of dawn. Mercury — the brighter of the two — will be on the left and Saturn will be on the right. Saturn will rise last on the eastern horizon at 5:48 a.m. EDT, 9 minutes after morning twilight begins. You will only have about 20 minutes to view the pair, as by 30 minutes before sunrise (i.e., 6:09 a.m.) the sky will become too bright to see them.
April 12 Saturday, April 12, 2025, is the International Day of Human Space Flight as declared by the United Nations to mark the date of the first human space flight.
The full moon after next will be April 12 at 8:22 p.m. EDT. This will be on April 13 in Coordinated Universal Time (UTC) and from the Azores, Iceland, Liberia, and Senegal times zones eastward across Africa, Eurasia, and Australia to the International Date Line in the mid-Pacific. Most commercial calendars are based on UTC and will show this full moon on April 13. The Moon will appear full for about three days around this time, from Friday evening into Monday morning, making this a full moon weekend.
Saturday evening into Sunday morning, the bright star Spica will appear close to the full moon. As evening twilight ends at 8:43 p.m., Spica will be less than a degree to the upper left of the Moon. Spica will appear to rotate clockwise and shift away from the Moon as the night progresses.
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By NASA
The Crew Health and Performance Exploration Analog (CHAPEA) team hosts a Media Day at NASA’s Johnson Space Center in Houston on April 11, 2023.Credit: NASA Media are invited to visit NASA’s simulated Mars habitat on Monday, March 10, at the agency’s Johnson Space Center in Houston. The simulation will help prepare humanity for future missions to the Red Planet.
This is the second of three missions as part of NASA’s CHAPEA (Crew Health and Performance Exploration Analog), set to begin in May 2025 when volunteer crew members enter the 3D printed habitat to live and work for a year.
During the mission, crew members will carry out different types of mission activities, including simulated “marswalks,” robotic operations, habitat maintenance, personal hygiene, exercise, and crop growth. Crew also will face planned environmental stressors such as resource limitations, isolation, and equipment failure.
The in-person media event includes an opportunity to speak with subject matter experts and capture b-roll and photos inside the habitat. Crew members will arrive for training at a later date and will not be available at this event.
To attend the event, U.S. media must request accreditation by 5 p.m. CDT Monday, March 3, and international media by 5 p.m., Monday, Feb. 24, via the NASA Johnson newsroom at: 281-483-5111 or jsccommu@nasa.gov. Media accreditation will be limited due to limited space inside the habitat. Confirmed media will receive additional details on how to participate.
For more information about CHAPEA, visit:
https://www.nasa.gov/humans-in-space/chapea
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Cindy Anderson / James Gannon
Headquarters, Washington
202-358-1600
cindy.anderson@nasa.gov / james.h.gannon@nasa.gov
Kelsey Spivey
Johnson Space Center, Houston
281-483-5111
kelsey.m.spivey@nasa.gov
Victoria Segovia
Johnson Space Center, Houston
281-483-5111
victoria.segovia@nasa.gov
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Last Updated Feb 20, 2025 LocationNASA Headquarters Related Terms
Humans in Space Analog Field Testing Crew Health and Performance Exploration Analog (CHAPEA) Johnson Space Center View the full article
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