A new "biosignature" for our own planet may help astronomers find exoplanets that could support life—or other worlds that already do.

Microbes from salty, subzero waters in the Arctic could give researchers a glimpse of the kinds of environments where they might one day find alien life.

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.