Add Yahoo as a preferred source to see more of our stories on Google. The great physicist Enrico Fermi first posed the challenging question over half a century ago, wondering why we appear to be alone ...

The moment of first contact with extraterrestrials is a staple of science fiction. It usually involves a frantic scientist having a Eureka moment, realising in a single dramatic instant that Earth is ...

The search for extraterrestrial intelligence has traditionally focused on detecting radio signals or laser transmissions from distant civilisations. But a new study proposes a very different idea: ...