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

Long thought of as a dry, barren world, Mars may once have shimmered with shades of blue. A new study reveals the discovery ...

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 ...

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

Researchers believe Perseverance recorded 55 instances of "mini lightning," providing the first sound evidence of Martian electrical activity. The lightning occurs during dust storms and dust devils, ...

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

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

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

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