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

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

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

New simulations show red planet affects Milankovitch cycles that shape how solar energy is distributed on Earth over millions ...

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

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

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 ...

A Congressional bill restores funding for most NASA space science missions, but there is no money for returning samples ...