A NASA telescope is barely clinging to space after a failed rescue effort left it tottering and sinking toward Earth. A few pieces that don't burn up in the atmosphere are expected to land in the ocean on or about Friday.

A nearly 3,000-pound NASA space telescope that has spent more than two decades studying some of the universe's most powerful explosions is expected to come crashing back to Earth in the coming days,

A NASA telescope that's been falling out of orbit for months is expected to crash back to Earth. The U.S. Space Force predicts it'll re-enter the atmosphere Friday.

NASA linked Swift’s faster orbital decline in part to solar activity and said resumed observations also increased drag. Some dense components may survive re-entry, the mission’s chief scientist told The Associated Press.

The second crew that spent a year inside NASA's simulated Mars habitat is emerging today, and the agency will stream it live.

After 378 days inside, Mission 2 is finally over—and four people are about to get reacquainted with Houston.

The four members of a crew who took part in a simulated mission to Mars have emerged after 378 days in isolation at the US space agency's Johnson Space Center in Houston, an endeavor designed to help prepare for a possible future excursion by NASA astronauts to Earth's planetary neighbor.

The four volunteers were in a 3D-printed habitat designed to simulate what it would be like to live on Mars.