Using data gathered by NASA's Juno Jupiter orbiter, scientists estimate that Europa's ice shell is about 18 miles thick — which could make it hard for nutrients to get down to its buried ocean.

But the real truth is that alien life on other planets could be even stranger than floating balloons or amorphous organisms ...

On Thursday the U.S. president ordered the release of federal files related to UFOs and aliens, although no evidence of extraterrestrials visiting Earth is known to exist ...

A new system capable of identifying complex molecular signatures could aid in the search for alien life in the universe and could even lead to the creation of new forms of life in the laboratory, ...

Jupiter’s moon Europa has long looked like a frozen cue ball, its bright shell of ice hiding a global ocean that many astrobiologists see as one of the most promising places for life beyond Earth. New ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Ammonia-bearing compounds ...

The Science: Europa has been considered as a top contender for alien life for even longer than Enceladus, thanks to its massive under-ice liquid water oceans. It also displays water vapor plumes ...

The odds are that life is out there – but rather than little green men, it may look more like hydrothermal vent tubeworms ...