NASA astronaut Nichole Ayers photographed a rare atmospheric phenomenon over the US and Mexico known as a "sprite" that's associated with lightning.

An astronaut aboard the International Space Station has shared a striking photo of what is known as a Transient Luminous Event seen above a thunderstorm over Mexico and the Desert Southwest earlier… ...

Two commercial satellites have completed an undocking maneuver high above Earth, signaling the successful end to a pioneering spacecraft life-extension mission.

That’s the planet Earth, as photographed from about 3.7 billion miles away 35 years ago Friday, on Feb. 14, 1990. “That’s home,” famed astronomer Carl Sagan would write.

The Polaris Dawn mission reached new heights on Tuesday as It reached an orbit of 870 miles above the Earth's surface, the farthest humans have been away from the planet since the 1970s.

The astronauts on the I.S.S. — including two who were scheduled to return months ago — held a zero-gravity cookie-decorating contest and built a reindeer from storage bags.

And although the oldest ice discovered so far dates back to 2.7 million years ago, this particular ice has been pushed beneath the layers of thick ice by Earth’s movements.

A tech billionaire performed the first private spacewalk hundreds of miles above Earth on Thursday, a high-risk endeavor reserved for professional astronauts — until now.Tech entrepreneur Jared ...

Scientists have detected something strange in Earth’s magnetosphere, some 100,000 miles away from the ground. Split-second bursts of energy known as chorus waves were found “chirping” in an ...

CAPE CANAVERAL, Fla. — A tech billionaire performed the first private spacewalk hundreds of miles above Earth on Thursday, a high-risk endeavor reserved for professional astronauts — until now ...

The astronauts — including two whose return is long overdue — held a zero-gravity cookie-decorating contest and built a reindeer from storage bags.