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In honor of NASA's Voyager 1 probe's 40th anniversary today (Aug. 5), William Shatner helped send a special message to the distant spacecraft, selected by...

An early-stage mission concept could see laser-driven light-sail probes visit the notorious asteroid Apophis during its 2029 close flyby of Earth.

We Finally Know What Happened to Water on Mars. Liquid Water on Mars. Nasa scientists find evidence of flowing water on Mars. Here Are All the Best Photos from

The newly-created U.S. Space Force has accused Russia of using a pair of its satellites to tail a U.S. spy satellite, calling it "disturbing behavior" while...

Scientists say the search for life should be top priority for future Mars probes.

Some observers hoping for a big blast from NASA's moon-slam experiment Friday were a bit disappointed.

With a miniaturized space probe capable of being accelerated to a quarter of the speed of light, we could reach Alpha Centauri, our nearest star, in 20 to 50...

A super-powerful camera orbiting Mars may help discover the fate of long-lost spacecraft that never phoned home after reaching the red planet.

NASA science instruments are hitching rides to the moon on two foreign lunar landers.

A proposed launcher would use the motions of the ancient slingshot to send objects hurling into space.