Life on Mars? Two Compelling Discoveries May Hold the Answer

This reconstructed image of a mountain range in Svalbard, Norway, was altered to show why scientists believe a lake existed on Mars. The mountain range represents the suspected rim of the planet's Gale Crater, which surrounds Mount Sharp. Water from the snowmelt flowed down the mountain into a fan and delta, as seen here, which would have created layered sediment in the middle of the crater.