One might not imagine such a time being conducive to the existence of fragile lifeforms, yet it is likely to be the era in which Mars was most habitable ...

Mars is covered in a fine dust that’s rich in iron oxides. You might know these compounds better as rust, the same stuff that forms when you leave an old bicycle out in the rain too long. On Earth, ...

A recent study showed that Mars was warm and wet billions of years ago. The finding contrasts with another theory that this era was mainly cold and icy. The result has implications for the idea that ...