Mars may have once possessed an ocean at least as large as Earth's Arctic Ocean, a new study suggests. Previous research ...

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

New research suggests Mars was once a blue planet, as scientists identify river deltas and signs of a vast ancient ocean on ...

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 ...

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 ...