Peel away the snapping jaws and acid blood of the Alien franchise, and you'll find that what really drives this enduring saga is something far more primal. The ticking clock of pregnancy, the ...

Astrobiologists believe the presence of laughing gas in a distant planet's atmosphere could indicate life. Nitrous oxide is a greenhouse gas emitted by plants, making it a biosignature, or a compound ...

Laughing gas could be a key sign of life on alien planets – but it’s not because aliens are having their teeth extracted under anaesthetic. Instead, the gas is commonly generated by lifeforms on Earth ...