Mars may have been a "blue planet" with an ocean the size of today's Arctic Ocean, a new study suggests.

A pull in the right direction ...

Mars, long admired for its rusty hue and alien deserts, may play a far greater role in shaping life on Earth than once ...

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in ...

Arcadia Planitia does not draw attention in the way Mars’s great canyons or volcanoes do. It sits quietly across the northern ...

This doesn’t mean Mars causes ice ages on its own. Orbital cycles are only part of the picture. Earth’s oceans, atmosphere, ...

Mars has an active, electrically charged surface where dust storms and spinning dust devils regularly move and reshape the ...

A study by scientists at Penn State and NASA shows that intact biomolecules from dormant microbes break down much more slowly ...

Mars, often depicted as a barren red planet, is far from lifeless. With its thin atmosphere and dusty surface, it is an energetic and electrically charged environment where dust storms and dust devils ...

NASA's plans for Mars sample return are effectively cancelled as part of a bill approved by the U.S. Congress, ending efforts ...

Scientists have traced ancient Martian shorelines inside a giant canyon, revealing where a vast ocean once stood and why ...

NASA says it is “very unlikely” the agency will be able to recover a Mars spacecraft that has been out of contact for more ...