Thirty years after the first exoplanet was found in 1995, NASA's counter of confirmed worlds outside our Solar System crossed ...

Aliens have long been a staple of science fiction. Yet the possibility of intelligent life beyond Earth is more than a matter of imagination—it is also a subject of serious scientific inquiry.

This article predates the current owners of Science Blog. It has not been reviewed under the current editorial process and is kept as part of the archive. Four hundred light years away, a planet ...

One of the greatest mysteries of life is whether we are alone in the cosmos. The laws of probability suggest we aren’t, but despite centuries of searching, we have never seen any clear evidence of ...