"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 ...

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

Mars haunts us as a vision of a planet gone wrong. It was once warm and wet, with rivers flowing across its surface and ...

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

Did Mars have lakes and rivers during a single period or over separate periods? This is what a recent study published in ...

If Mars was once habitable, some amount of water was required. We studied the mineral zircon in a meteorite from Mars and found evidence that water was present when the zircon crystal formed 4.45 ...

Arrival in early-to-mid December 2028 would place the spacecraft at Mars during northern hemisphere spring, providing ...

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

Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic mission may investigate the area one day.

President Trump pledges in inaugural address to pursue policy that 'expands our territory' and to put US astronauts on Mars.

Research suggests that an ancient shoreline helped to sculpt the drop between Mars' southern and northern hemispheres.