SpaceX sent a pioneering private reentry capsule to space today (April 21) on a rideshare mission called Bandwagon-3.

Don Pettit, NASA's oldest active astronaut, marked his 70th birthday by landing on the steppe of Kazakhstan after 220 days in space.

Not every space traveler has worn a suit or walked upright. From monkeys to microscopic marvels, these species show how far ...

Astronomers raised hopes that humanity might not be alone in the universe by announcing on Thursday they have detected the ...