Mars has its own water cycle, explaining why it lost its water over time
An artist’s impression of how Mars could have looked billions of years ago, with an ocean covering part of its surface.NASA/GSFC When you were at school, you likely learned about the Earth’s water cycle: how water evaporates from the surface of oceans and lakes when they are warmed by the Sun, rising into the atmosphere and settling as clouds, then falling back to Earth as rain. But now scientists have discovered a very different sort of water cycle that could be operating on Mars....