Alien life could take many different forms, but one possibility is captivating scientists: alien "plants". What would they look like? And how could we find them? On the Orion arm of the Milky Way ...

Alien life may one day be found not from radio signals beamed across the cosmos but from an all-too-familiar side-effect of civilisation: pollution. It's the Earth's atmosphere that he's usually ...

The exoplanet, called K2-18b, contains huge quantities of dimethyl sulphide - a chemical only produced by living organisms. The planet is 124 light-years from Earth - so it would take us hundreds of ...