Seti #A change of fluids 17 April 2017 fborgosano Leave a comment Share: A Piece of Mars: Water carved this ~800 m (0.5 mi) wide channel billions of years ago. The water dried up, and since then it’s been sand that flows through here (from the right), building up lovely dunes. A single … Continue reading → from Welcome to Cosmic Diary bit.ly/2pK9qB4 Share: