Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the ...

"Its special properties make the galaxy an ideal candidate for further research into merging black holes and the associated gravitational waves." ...

Cultural artifacts sent to space now include human remains, commemorative disks, and symbolic payloads from missions like SpaceX and UNESCO.

The U.S. Space Force will launch the X-37B Orbital Test Vehicle on Aug. 21, 2025, from Kennedy Space Center, Florida. The U.S ...

Astronomers have long speculated about the existence of a mysterious planet lurking far beyond Neptune, a world several times ...

The space plane’s test flight will advance development of a new navigation technology based on electromagnetic wave ...

The X-37B, the US Space Force's secretive space plane, will soon take flight again.

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