Astronomers think small space rocks from beyond our solar system routinely strike Earth—but proving it isn’t easy ...

The newly released images from a December flyby are so detailed that scientists can see explosions and the flow of solar winds.

Heliostats that harness sunlight by day could help detect asteroids by night, offering the U.S. a scalable planetary defense ...

Along with launching two NASA probes, the SpaceX Falcon 9 rocket carried five other satellites into orbit with goals ranging ...

You’d think we’d have the solar system pretty well figured out by now. It’s our own cosmic backyard, after all. […] ...

Astronomers have likely witnessed a planet forming in real time, seen inside a spiral arm of the HD 135344B protoplanetary ...

The moon's thin atmosphere, called an exosphere, has been a puzzle to science for some time. Two main processes were thought ...

The same charged particles from the Sun’s atmosphere responsible for the northern lights can also damage Earth’s electrical and communications systems.

Evidence that rocky planets beyond Jupiter formed as rapidly, and at the same time, as the inner planets could transform our ...