“Lost!” How Mars’ Ancient Ocean Vanished into Space

  In the ancient past, said Michael Mumma, a senior scientist at NASA’s Goddard Space Flight Center, Mars had an ocean that covered about 20 percent of the planet’s surface area — “a respectable ocean.” The body of water was about 5,000 feet (1,500 meters) deep, on average. Today, only 13 percent of that ancient … Continue reading “Lost!” How Mars’ Ancient Ocean Vanished into Space