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China is set to launch a unmanned spacecraft on Tuesday to dock with a capsule orbiting the Earth, as part of its work to build a space station.

Many of Earth's species appear to be shrinking in size, a new study reports, and its authors think that's probably due to global warming.

A small asteroid zipped by Earth well inside the orbit of the moon on Friday, marking the second known space-rock encounter for our planet over the past week, NASA said.

Warming up on its solar cycle, the sun uncorked a a strong solar storm that reached Earth on Monday, federal scientists said, posing a threat to satellites and radio communications, although no interruptions had been reported to date.

A six-ton NASA science satellite crashed to Earth on Saturday, leaving a mystery about where a ton of space debris may have landed.

NASA's dead six-ton satellite fell to Earth early Saturday morning, starting its fiery death plunge somewhere over the vast Pacific Ocean....

A pair of spacecraft rocketed toward the moon Saturday on the first mission dedicated to measuring lunar gravity and determining what’s inside Earth’s orbiting companion — all the way down to the core. “I could hardly be happier,” said the lead scientist, Maria Zuber. After two days of delays and almost another, “I was trying to be as calm as I could be.”

The PAMELA satellite has discovered that there's an antiproton belt present in the Earth's magnetosphere.

In a spectacle that might have beguiled poets, lovers and songwriters if only they had been around to see it, Earth once had two moons, astronomers now think. But the smaller one smashed into the other in what is being called the "big splat."...

A massive, long-ago extinction was once thought to have been caused by a destructive wave of volcanic activity. Scientists now point their fingers at another culprit. A giant, deadly “Earth burp.”