To support alien life, a planet doesn’t have to be exactly like Earth, but it does need a few key ingredients. First, it should orbit its star at the right distance, where temperatures allow liquid ...

A newly developed computer model reveals that rocky planets must have a radius at least 80 per cent of Earth to maintain a ...

Scientists are listening in on sperm whale conversations and studying Earth's strangest microbes to prepare humanity for first contact with extraterrestrial life. Tardigrades—a type of invertebrate ...