"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 ...

Molecules friendly to life have been found in samples of the asteroid Bennu, which NASA collected with a robotic probe five ...

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

Astronomers who identified HD 20794 d say its proximity to its host star and orbital pattern suggest it could hold water.

The fact that the cold, dry Mars of today had flowing rivers and lakes several billion years ago has puzzled scientists for ...

The 3.7-billion-year-old formations in the planet's Gale Crater suggest the presence of long-gone bodies of liquid water, ...

The northern plains of Mars, marked by thousands of mounds and hills, hold significant evidence of the planet's watery past.

From celebrations large and small, to the thousands who became new citizens and tens of thousands of others who rallied for ...

But there is good news coming from the small Mars rover Curiosity. A new study using imagery from the rover shows evidence ...

Thousands of mysterious clay mounds found on Mars were formed by ancient water on the Red Planet's barren northern plains, ...