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

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

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very ...

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

Thin, seasonal ice may have protected ancient lakes on Mars, allowing liquid water to last for decades despite cold temperatures.

New research has mapped 16 extensive, interlaced river systems on Mars, dating back approximately 3.7 billion years to the Early Hesperian Period. These large river systems, despite covering only ...

A 3.5-billion-year old rock discovered on the Red Planet is "the closest we've come to discovering ancient life on Mars," according to NASA. Potential signs of microbial life were found in a rock ...

Mars once had sprawling river systems that rivaled major watersheds on Earth, and scientists have now identified the biggest ones for the first time. Researchers mapped 16 massive drainage basins ...

Scientists suspect that the surface of Mars was once teeming with water, a lush oasis full of river systems and lakes — until a dramatic change in the planet’s magnetic field caused it to lose most of ...