Scientists have found that young stellar cousins of our Sun are calming down and dimming more quickly in their X-ray output than previously thought, according to a study using NASA’s Chandra X-ray Observatory.

This image, released in celebration of Earth Day, shows the terminator – the line between night and day – on Earth. The Artemis II astronauts captured this view on April 2, 2026, during their journey to the Moon.

This image that NASA’s Hubble Space Telescope captured of the Crab Nebula, paired with its past observations and those of other telescopes, allows astronomers to study how the supernova remnant is expanding and evolving over time.

NASA’s X-59 quiet supersonic research aircraft flies over the Mojave Desert in California on April 14, 2026.

An observation made by NASA’s SPHEREx mission reveals vast frozen complexes in the Cygnus X star-forming region of the Milky Way galaxy. The chemical signature of water ice is shown as bright blue structures, while polycyclic aromatic hydrocarbons are in orange.

A portion of the Moon’s far side is seen along the terminator—the boundary between lunar day and night—where low-angle sunlight casts long shadows across the surface.

NASA’s Artemis II crew shared brief remarks with friends, family, and colleagues after they landed at Ellington Airport near NASA’s Johnson Space Center in Houston on Saturday, April 11, 2026, after a nearly 10-day journey around the Moon and back to Earth.

NASA astronaut Christina Koch, Artemis II mission specialist hugs the Orion spacecraft in the well deck of USS John P. Murtha, Saturday, April 11, 2026.

NASA astronauts Reid Wiseman, commander; left, Christina Koch, mission specialist; CSA (Canadian Space Agency) astronaut Jeremy Hansen, mission specialist; and NASA astronaut Victor Glover, Artemis II pilot, right, pose for a group photo after viewing the Orion spacecraft in the well deck of USS John P. Murtha, Saturday, April 11, 2026, in the Pacific Ocean off the coast of California. The quartet splashed down Friday, April 10 at 5:07 p.m. PDT (8:07p.m. EDT).

NASA’s Orion spacecraft with Artemis II crewmembers NASA astronauts Reid Wiseman, commander; Victor Glover, pilot; Christina Koch, mission specialist; and CSA (Canadian Space Agency) astronaut Jeremy Hansen, mission specialist aboard is seen under parachutes as it lands in the Pacific Ocean off the coast of California, Friday, April 10, 2026. NASA’s Artemis II mission took Wiseman, Glover, Koch, and Hansen on a 10-day journey around the Moon and back to Earth. Following a splashdown at 8:07 p.m. EDT, NASA, U.S. Navy, and U.S. Air Force teams are working to bring the crewmembers and Orion spacecraft aboard USS John P. Murtha.