New research expands the pool of habitable worlds to include super-Earths with hydrogen-rich atmospheres.

River delta deposits in Mars' Jezero crater formed on and off for 400,000 years—long enough to record evidence of ancient life, new research shows.

"We think we have found the building blocks of life—the Lego set that led, ultimately, to the evolution of cells, animals, and plants."

"We think we have found the building blocks of life—the Lego set that led, ultimately, to the evolution of cells, animals, and plants."

"We don't only look at other planets to know what's out there. It's also a way for us to learn things about the planet that's under our own feet."

The proto-Earth formed surprisingly quickly, new research shows. The finding ups the chance of finding water and life on other planets.

A new theory involving volcanoes may partly explain the appearance of the first oxygen on Earth 2.5 billion years ago, researchers say.

On this podcast episode, a planet hunter talks about our chances of finding alien life and other habitable worlds.

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.