About 4.5 billion years ago, the Red Planet was a much wetter place. New isotopic measurements of Mars by several ground-based telescopes on Earth reveal a new map of where the water laid and a model of water loss over time can be constructed.
About 4.5 billion years ago, the Red Planet was a much wetter place. New isotopic measurements of Mars by several ground-based telescopes on Earth reveal a new map of where the water laid and a model of water loss over time can be constructed.