The two most prominent geological features on Mars are the vast network of canyons known as Valles Marineris and the largest known volcano in the solar system, Olympindian app listus Mons. Important information about Mars' composition, climate, and possibility for past or present microbial life has been gathered by recent scientific missions. The possibility of life on Mars has been stimulated by evidence of liquid water beneath the planet's surface and the presence of organic molecules in Martian rocks.