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

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

The existence of water on Mars has been a hot topic in planetary science, with several studies having already provided evidence of water bodies on the Red Planet, which indicate that it might have had ...

Ancient shoreline features hint that water on Mars once formed a vast ocean.

Mars, long painted as a frozen desert, is starting to look more like a planet that once knew the feel of warm rain and flowing water. A new wave of research argues that the Red Planet may have spent ...

A recent photo from NASA's Curiosity rover gives an idea of what Mars would look like under skies that resemble our own on Earth. Take a look.

Spacecraft orbiting the Red Planet have helped researchers map out an ancient coastline that surrounded a large ocean billions of years ago ...