Perseverance rover discovers evidence of ancient Martian rivers.

NASA's Perseverance rover has discovered evidence of a deep, fast-flowing river on Mars, the first time such evidence has been found on the planet. The rover found a long-dead riverbed in Jezero crater, featuring coarse grains and cobbles, which indicate a high-energy river that's carrying a lot of debris. The rover also found sedimentary rock layers at a nearby hill called Pinestand, which could have been formed by a deep, fast-moving river. The Jezero crater hosted a big lake and a river delta long ago, and researchers think it was capable of supporting Earth-like life long ago.