Solar System

NASA's OSIRIS-REx asteroid-sampling mission formally ended on Sept. 30, 2026, though scientists will continue to study the pieces of space rock it returned for decades.

One new study shows how much the moon has diminished over time.

The European Space Agency's Copernicus Sentinel-3 satellite mission captured a close-up of West Antarctica from its perch high above Earth.

Known as the giant-impact hypothesis, this proposed event involves a collision between Earth and a hypothetical Mars-sized protoplanet astronomers call Theia.

Japan will launch its audacious MMX sample-return mission to Mars today (Oct. 19), and you can watch the historic action live.

Two leading space scientists say there is a need to redefine the edge of the solar system based on the Milky Way's gravity, including its dark matter.

"Just like here on Earth, Mars helicopters can cover distance quickly and can go places that might be impossible to reach by ground."

The location of Earth's geographic poles has changed several times over the past 320 million years in a process known as true polar wander.

NASA is asking for ideas to stop static electricity from zapping astronauts or critical hardware during moon missions.