The sighting of a bright red sphere racing out of our galaxy at extreme speed has handed NASA one of its strangest puzzles in ...

Nemesis theory suggests a hidden brown dwarf companion star triggers mass extinctions every 26 million years, but advanced ...

Scientists have detected what they believe to be lightning on Mars by eavesdropping on the whirling wind recorded by NASA's ...

Unexplained gamma ray radiation coming from the edge of the Milky Way galaxy could be produced by self-annihilating dark matter particles – but the idea requires further investigation ...