Add Yahoo as a preferred source to see more of our stories on Google. Species introduced by humans to areas where they don't naturally occur are a worldwide problem. These "alien species" can cost a ...

There's even a mission to probe it – using a very interesting spacecraft ALIEN life could be hiding away on the vast ocean of a nearby moon. Scientists say there’s a chance that a “small population” ...

Alien life may one day be found not from radio signals beamed across the cosmos but from an all-too-familiar side-effect of civilisation: pollution. It's the Earth's atmosphere that he's usually ...

In 1970, scientists identified a meteor-like object that had entered our Solar System. The US probe Mariner 10 was returning from an unrelated mission to photograph Saturn when it passed the object.