Thousands of mounds and hills in Mars' barren northern plains are full of clay minerals, providing evidence that the rocks here were once soaked with water, a new study reveals. These mounds are ...

Thousands of hills and mounds on Mars have been found to contain layers of clay minerals, which formed when running water interacted with the rocks during a period when Mars' northern reaches were ...

Mysterious mounds on Mars were formed by ancient water, says a British study. These mounds are all that is left of a landscape, roughly the size of the UK, that has been almost entirely eroded away.

Thousands of hills and mounds on Mars have been found to contain layers of clay minerals, which formed when running water interacted with the rocks during a period when Mars' northern reaches were ...