NASA has announced the discovery of an Earth-like planet orbiting a Sun-like star that shares several other similarities with ...

The International Space Station (ISS) is now orbiting Earth at a record altitude of 262 miles (422 km). It was deliberately nudged to a higher position just recently by a SpaceX Dragon spacecraft.

There are about 15,000 satellites orbiting Earth. Most of them, like the International Space Station and the Hubble Telescope, reside in low Earth orbit, or LEO, which tops out at about 1,200 miles (2 ...

For generations, UFO enthusiasts have longed for claims of aliens visiting Earth to be seriously investigated by scientists. Now they are getting their wish. This month prominent peer-reviewed ...