The oceans on Saturn's moon Enceladus may have the chemical fuel necessary for life. If there's any around, that is.

A shower of high-energy particles and nearby planets' gravitational pull may make planets in the "habitable zone" of the TRAPPIST-1 system anything but.

Our planet is 4.5 billion years old, but its inner core may be a lot younger.

New research debunks the conventional wisdom that oxygen and organic compounds in the atmosphere are strong evidence of alien life.

A new report recommends we build a telescope to directly image Earth-like exoplanets. Astrophysicist Bruce Macintosh explains why that's a good idea.