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

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

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

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

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

Caltech scientists published a study using NASA Curiosity rover imagery showing the past existence of warm water on Mars.

The car-sized Curiosity rover has spotted evidence of once quite hospitable environs on Mars.