Astronomers have discovered an exoplanet that might have favorable conditions for liquid water. This planet, HD 20794 d, ...

Mars haunts us as a vision of a planet gone wrong. It was once warm and wet, with rivers flowing across its surface and ...

"It's been such a puzzle that there was liquid water on Mars, because Mars is further from the sun, and also, the sun was ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Though it's a cold, dead planet, Mars still has its own natural beauty about it. This image shows us something we'll never ...

Harvard scientists explain how Mars had warm spells billions of years ago, allowing rivers and lakes to exist.

A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for decades. Now, Harvard researchers think they have a good explanation for a ...

One of my gripes with "The Martian" movie was the depiction of the winds on Mars. The lower air density means that the sort ...

Rootless cones are small volcanic landforms ranging from several to several hundred meters in diameter, formed by continuous ...

New research reveals ancient ripples on Mars, providing compelling evidence of long-lost lakes that once existed 3.7 billion ...

Heads up! Four planets are visible in the evening sky this month, and another two planets can be found with a little help.