Today, Mars is a desolate wasteland, with dusty red rocks and sand stretching out to the horizon. But billions of years ago, it was a vastly different world. It was blue, with oceans, rivers, lakes, and maybe life? Let’s tell the story of geology on Mars, and we got from that world to the one … Continue reading "Astronomy Cast Ep. 432: Geoglogic Ages of Mars – From Wet and Wild to Desolate Desert"