Where Did Water on Mars Go? Maybe, Nowhere.

Water on Mars disappeared long ago — or did it? Could Mars still hold onto to vast oceans worth of water?

Roughly four billion years ago, Mars was a water world. Is it possible that most of that water is still there? Image credit: ESO/M. Kornmesser/N. Risinger/skysurvey org

Mars was once a water world, filled with massive oceans, rivers and lakes. At one time, the Red Planet could have held onto enough water to cover that world with a global ocean between 100 to 1,500 meters (330 to 4,900 feet) deep — about half the volume of the Atlantic Ocean.

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The Cosmic Companion

The Cosmic Companion

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Writing about space since I was 10, still not Carl Sagan. Weekly video show, podcast, comics, more: www.thecosmiccompanion.net