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"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 ...

Earth is home to some truly bizarre and breathtaking landscapes — here are 20 that look straight out of an alien world.

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

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

Experts told Newsweek about the difficulties of reaching Mars as the United States faces complex challenges in space policy.

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

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.

meaning the planets appear close together in the night sky from Earth. These two planets are visible in the southwest ...

UK researchers have confirmed the existence of a “super Earth” located 20 light-years away that could reveal the existence of ...