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On the eastern, arid side of the Andes, the plains of southern Argentina stretch from the mountains to the Atlantic coast. The landscape often appears dry and brown, interrupted by colorful glacier-fed lakes, but a storm in early April 2026 blanketed swaths of the land in white. The MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra satellite captured this image of the snowy Patagonian Desert on the morning of April 3.
Early fall has been wetter than normal in southern Patagonia, said atmospheric scientist René Garreaud of the Universidad de Chile, noting that satellite-based estimates showed above-average precipitation from late March through early April. Much of the region’s precipitation tends to fall on the western, windward side of the Andes, he said. “But strong winds are capable of blowing some snow east into the Argentinian side, as beautifully reflected in the MODIS image.”
Snow clings to the higher elevations, while valleys draining the large glacial lakes are bare. In this detailed Landsat image, a stark snow line appears along the outlet of Lago Argentino. Also note the color of the water. Lago Argentino and other nearby lakes contain an abundance of fine sediment, or glacial flour, pulverized by southern Patagonia’s plentiful glaciers. This suspended sediment makes the lakes appear milky blue or turquoise.
Though snow was widespread across the desert after the early-season storm, the wintry splendor was fleeting. A satellite view from the afternoon of April 4 showed that snow had melted from all but the highest mountain areas.
NASA Earth Observatory images by Michala Garrison, using MODIS data from NASA EOSDIS LANCE and GIBS/Worldview, and Landsat data from the U.S. Geological Survey. Story by Lindsey Doermann.
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2026-04-08 18:13

Twin control rooms at NASA’s Marshall Space Flight Center in Huntsville, Alabama, are actively supporting real-time mission operations in lunar orbit as part of the agency’s Artemis II mission, helping ensure astronaut safety and mission success as the crew prepares to return to Earth Friday, April 10.
The LUCA (Lunar Utilization Control Area) and LESA (Lander Engineering Support Area) rooms are part of the Huntsville Operations Support Center at NASA Marshall. While the spaces look nearly identical, the two are more like fraternal twins in their focus areas: LUCA primarily supports Artemis science operations, while LESA will provide engineering support for landing astronauts on the Moon.

“The Huntsville Operations Support Center at NASA Marshall can be adapted to the needs of the agency’s missions, and LUCA and LESA are some of our newest configurable control rooms for the Artemis campaign,” said Harish Chandranath, Payload and Mission Operations Division Human Landing Systems project lead at Marshall. “In addition to supporting Artemis, our Huntsville Operations Support Center teams also support the Commercial Crew Program, the SLS (Space Launch System) rocket, and International Space Station science operations.”
Support center services include work to manage spacecraft command and telemetry, local and remote voice services for international connections, live and recorded video services, and a telescience resource kit – special software that makes sure two computers far apart can communicate without missing any information and without human help. All Huntsville Operations Support Center services can be tied into both the LUCA and LESA rooms, giving operators the capability to use data and communicate with scientists and experts around the world.
During Artemis II, teams in LUCA are supporting first-of-their-kind science operations designed to better understand the effects of deep space – such as microgravity and radiation – on crew physiology, immune response, and performance. The data gathered during the mission will inform future crewed flights to the Moon.
Meanwhile, teams in LESA are observing Artemis II mission operations in real time, which is a critical opportunity to refine processes and prepare for future crewed landings on the Moon’s surface. For Artemis missions, members of NASA’s Human Landing System Mission Insight Support Team – including engineers, safety leads, flight operations experts, and technical authorities – will operate from LESA to monitor lander systems and support key decision-making.
Through the Artemis program, NASA is returning humans to the Moon for scientific discovery, economic opportunity, and to build the foundation for the first crewed missions to Mars – for the benefit of all.
To learn more about the Artemis program, visit:
2026-04-08 17:12
The Moon, seen here backlit by the Sun during a solar eclipse on April 6, 2026, is photographed by one of the cameras on the Orion spacecraft’s solar array wings. During lunar flyby, the Artemis II astronauts observed a solar eclipse that only they could see due to their unique position.
See more photos from the Artemis II mission.
Image credit: NASA
2026-04-08 04:01
Take a tour through volcanic history on the edge of the Sierra Nevada near Mammoth Lakes, California. Between the tall granite peaks to the west and the Basin and Range province to the east, overlapping volcanic complexes imprint the landscape with a collection of craters, cones, and calderas. The area, still restless today, draws interest from geologists studying Earth’s processes and from planetary scientists exploring its commonalities with volcanic terrain elsewhere in our solar system.
A string of volcanic features between Mono Lake and Mammoth Mountain is visible along the left side of this Landsat image. Known as the Mono-Inyo Craters, this chain of about three dozen lava domes, lava flows, and tephra rings formed within the past 10,000 years. Explosive eruptions in the area date back even further, but evidence of those older events is no longer apparent at the surface.
Among the most recent activity in this chain, explosive eruptions formed Panum Crater near Mono Lake about 700 years ago. A strombolian eruption deposited a ring of pumice, ash, obsidian fragments, and other material around the vent. After that, a lava dome made of pumice and obsidian built up in the center, creating the concentric-circle pattern visible today.
South of the Mono-Inyo Craters, Mammoth Mountain is perhaps best known for its ample skiable terrain, but it has a volcanic side, as well. The mountain is made up of at least 25 overlapping lava domes. Its last magmatic eruptions took place about 57,000 years ago, but steam-driven phreatic eruptions and other unrest have occurred much more recently.
Scientists believe a magma intrusion beneath the mountain in 1989 set off a spate of seismicity and volcanic gas emissions. Venting of carbon dioxide gas has killed trees in the area, and the U.S. Geological Survey continues to monitor the mountain’s CO2 emissions. Researchers have previously worked with NASA airborne remote sensing technology to measure ecosystem responses to elevated volcanic CO2 around Mammoth Mountain. More recent projects have expanded these efforts to other volcanoes and incorporated satellite imagery to detect signs of gas emissions. These methods partly rely on changes observed in vegetation and could aid in earlier warnings of volcanic hazards.
The most dramatic volcanism in the region, however, is far older. A massive eruption 760,000 years ago formed the Long Valley Caldera. This oval-shaped area, measuring 10 by 20 miles (16 by 32 kilometers), is bounded by snowy ridges, with Mammoth Mountain just off its southwest rim. Crowley Lake, a reservoir on the Owens River, drains the area to the southeast.
The caldera was formed during a six-day-long eruption, during which 150 cubic miles (625 cubic kilometers) of material were ejected. (That’s about 20 times the amount that was spewed in the 1912 eruption of Novarupta, the largest on Earth in the 20th century.) As a result, the surface over the magma storage area subsided thousands of feet to create a vast depression. Scientists with NASA’s Goddard Instrument Field Team conducted research in the area in 2023 to better understand how similar massive eruptions on Mars and other planets and moons in our solar system may have altered their environments.
NASA Earth Observatory images by Lauren Dauphin, using Landsat data from the U.S. Geological Survey. Story by Lindsey Doermann.
Stay up-to-date with the latest content from NASA as we explore the universe and discover more about our home planet.

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2026-04-08 03:01

Leo is a prominent sight for stargazers in April. Its famous sickle, punctuated by the bright star Regulus, draws many a beginning stargazer’s eyes, inviting deeper looks into some of Leo’s celestial delights, including a great double star and a famous galactic trio.
Leo’s distinctive forward sickle, or “reverse question mark,” is easy to spot as it climbs the skies in the southeast after sunset. If you are having a difficult time spotting the sickle, look for bright Sirius and Procyon in Canis Major and Canis Minor. Complete a triangle by drawing two lines to the east, joining at the bright star Regulus, the “period” in the reverse question mark. Trailing them is a trio of bright stars forming an isosceles triangle, the brightest star in that formation named Denebola. Connecting these two patterns together forms the constellation of Leo the Lion, with the forward-facing sickle being the lion’s head and mane, and the rear triangle its hindquarters. Can you see this mighty feline? It might help to imagine Leo proudly sitting up and staring straight ahead, like a celestial Sphinx. To help find these objects, you can use online tools like Stellarium Web.
If you peer deeper into Leo with a small telescope or binoculars, you’ll find a notable double star! Look in the sickle of Leo for its second-brightest star, Algieba, also called Gamma Leonis. This star splits into two bright yellow stars even with a small magnification. You can make this “split” with binoculars, but it’s more apparent with a telescope. Compare the color and intensity of these two stars: do you notice any differences? There are other multiple-star systems in Leo; spend a few minutes scanning with your instrument of choice, and see what you discover.
One of the most famous sights in Leo is the “Leo Triplet”: three galaxies that appear to be close together. They are indeed gravitationally bound to one another, around 30 million light-years away! You’ll need a telescope to spot them, and use an eyepiece with a wide field of view to see all three galaxies at once! Look below the star Chertan to find galaxies M65, M66, and NGC 3628 – The Hamburger Galaxy. Compare and contrast the appearance of each galaxy – while they are all spiral galaxies, each one is tilted at different angles to our point of view! Do they all look like spiral galaxies to you?
April is Citizen Science Month, and there are some fun Leo-related activities you can participate in! If you enjoy
comparing the Triplets, the Galaxy Zoo project could use your eyes to help classify different galaxies from sky survey data! Looking at Leo itself can even help measure light pollution: the Globe at Night project uses Leo as their target constellation for sky quality observations from the Northern Hemisphere. Find and participate in many more NASA community science programs at NASA Citizen Science. Happy observing!
Originally posted by Dave Prosper: April 2021
Last Updated by Kat Troche: April 2026
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