NASA astronaut Sunita Williams has completed over 200 days in space even since she reached the International Space Station on ...

Sci-fi planets like Dune's Arrakis and Star Wars' Tatooine might look cool, but according to NASA they're more fiction than science.

A colossal explosion in the sky, unleashing energy hundreds of times greater than the Hiroshima bomb. A blinding flash nearly as bright as the Sun.