Earth may not be the only world with vast bodies of liquid water, and some distant planets could contain far more water than our own. Depending on a planet’s mass, temperature and composition, its ...
Alien life may not need the kind of home humans instinctively search for. Some of the strangest possibilities begin once ...
When it comes to the search for life elsewhere in the universe, methane and other chemical compounds are seen as signs of biology because they are often produced by living microbes. However, ...