Humans evolved through a series of highly unlikely events – so finding another intelligence like us would be like winning the lottery many times over.
For the first time, an instrument orbiting Mars and a rover on the surface have detected methane simultaneously – raising hopes for finding life on the red planet.
Parasites can tip the scales and take advantage of their hosts, stealing nutrients or resources. But can they control minds?
What is it that makes films about sharks so popular?
Star Trek: Discovery explores our corner of the block -- just a fraction of the galaxy. Some stars are better candidates for intelligent alien life, and it may not be anything like we imagine.
Ripley beat the patriarchy and a rampaging xenomorph - but Daniels isn't even given the chance.
The latest outing of the Alien film franchise pits another human crew against a terrifying enemy. But how does the science stack up?
New sci-fi movie has a fascinating approach to an old question.