In the vast universe, galaxies rotate in ways that don’t make sense if only visible matter is considered. For almost a ...

Could a reactionless, gravity-defying propulsion system actually work? A former NASA engineer says yes, but scientists are ...

Astronomers have discovered that the Small Magellanic Cloud, a nearby dwarf galaxy, is being torn apart by the gravitational ...

Katy Perry revealed how she is preparing for her journey to space on a Blue Origin rocket. The singer is flying on an all-female mission April 14.