For as long as humans have looked toward the stars, one question has remained unanswered: how did life begin? Scientists have searched for clues in Earth’s ancient rocks, oceans, and chemistry, but ...

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 ...

Earth’s neighbor still has secrets that science is trying to figure out, and one of them is potential signs of life.

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

Given the size and age of the universe, it should be full of species with technology far more advanced than our own. But so far there is no trace ...