Europa is a prime candidate for life in our solar system, and its deep saltwater ocean has captivated scientists for decades.

All life consists of the same chemical building blocks. These include peptides, which perform various completely different body functions.

Black holes are more than just massive objects that swallow everything around them—they're also one of the universe's biggest energy sources

A new open data nonprofit scientific initiative by Avi Loeb will use a network of telescopes, cameras and computers to scan for alien life

NASA wants standards for evaluating claims of extraterrestrial life to help the public judge if discoveries are believable or not