If you walk outside tonight, look up and expect to see a green streak across the sky, you're going to see nothing. The comet ...

Astronomers want to collect as much data as possible using as many systems as possible. Sometimes that requires coordination ...

NASA Is Watching a Plane-Sized Asteroid Fly Past Earth Within Lunar Distance ...

The Science: Europa has been considered as a top contender for alien life for even longer than Enceladus, thanks to its massive under-ice liquid water oceans. It also displays water vapor plumes ...

According to the new data, Jupiter's radius measures 71,488 kilometers (44,421 miles) at its equator, and the planet rises 66,842 kilometers from its center to its north pole. That makes it 4 ...