Strange white rocks on Mars hint at millions of years of rain

Small, pale rocks scattered across Mars' reddish surface are offering fresh clues that parts of the planet may once have been far wetter than they are today. These light-colored spots stand out sharply against the surrounding terrain and suggest that some regions of Mars once hosted humid environments with frequent rainfall, similar to tropical areas on Earth.

1. Homepage
2. Science
3. Strange white rocks on Mars hint at millions of years of rain