A 4.45-Billion-Yr-Outdated Crystal From Mars Reveals the Planet Had Water From the Starting
Water is ubiquitous on Earth—about 70 % of Earth’s floor is roofed by the stuff. Water is within the air, on the floor, and inside rocks. Geologic proof suggests water has been secure on Earth since about 4.3 billion years in the past. The historical past of water on early Mars is much less sure….