Scientists hunting for life beyond Earth have long thought that water is one of the key indicators. But a group of experts now says that looking for life on water–rich planets could be a waste of time ...

MANY thousands of people around the world are convinced they have been abducted by extraterrestrial beings, taken on board alien spacecraft, subjected to painful medical examinations and then returned ...

Letters: Readers offer their explanations for the absence of hard evidence for extraterrestrial civilisations, in response to an article by Adam Kirsch ...