Researchers were also able to conclude that the planet likely took longer to become a dry, arid wasteland than previously predicted. While the process was slower and more dragged out, it started much earlier than predicted. Researchers hope to learn how much water has been lost from the planet. The water is not all gone—a vast sheet of water ice covers the planet’s North pole, and there’s evidence of subsurface liquid water on the planet. But there's still a key question: how much water was once present? The history and evolution of the planet’s water is of interest for a variety of reasons. Key among them is determining whether Mars could ever have supported life, and the answer to that question depends on conditions being just right at the right time. More via Ars Technica.
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