"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 ...

NASA is working on an exciting mission to send humans to Mars in the next few decades. To make this happen, the agency is ...

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

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, ...

A suspected planet that appears well-suited to life has had its existence confirmed – and it’s very much in our neighborhood, ...

Titan is the only moon in our solar system with a significant atmosphere. Now we have a very good idea of how this dense ...

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 ...

Mars' southern hemisphere absorbs a lot of the sun's energy during the Red Planet's spring, and that may be causing Mars' ...