An atmospheric haze around a distant planet—like the one which probably shrouded and cooled the young Earth—could show that the world is potentially habitable, or even be a sign of life itself.

Exoplanets are prime targets in the search for extraterrestrial life, but intense heat during early years may have left some uninhabitable, say astronomers.

Exoplanets roughly the size of Earth may be more likely to support life if they have companion planets. Here’s why ...

A fluctuating tilt in a planet’s orbit doesn’t rule out the possibility of life, new research shows. In fact, sometimes it helps.