Is there anybody out there and if there is will we ever meet them? These are the questions we often ask when we cast our eyes into the night sky, looking beyond the stars for extraterrestrials. Space aliens can come in all shapes and sizes, from bacterial microbes on Mars to potential Star Wars-like giants roaming the Galaxy, so be sure to check whether ET is flying around in a UFO, if the alien conspiracy theories are real, or if we really are being watched by little green men.

What if we find alien life?

Professor Stephen Hawking has launched a new, highly funded search for extraterrestrial intelligence, but what will happen if we actually do end up making first contact?

BBC Focus Magazine Subscription

A message to the stars

Should we be broadcasting our existence potential alien life? Not everyone thinks it’s a good idea, but that doesn't mean we haven't already done it...