"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 ...

NASA is working on a groundbreaking nuclear electric propulsion system that could dramatically speed up trips to Mars. The ...

Aside from Earth, no planet in the solar system captures our imagination quite like Mars. The Red Planet is one of the few ...

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

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.

Instead, they wait until the planet is properly aligned and then cruise to where Mars will be — seven or more months in the future. Mars and Earth come into alignment every 26 months ...

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

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

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

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

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