A simple model shows that a rocky planet close to its star may solidify so slowly that its water is lost to space and the planet becomes desiccated, whereas a planet farther out may solidify quickly and retain its water. See Letter p.607
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Elkins-Tanton, L. Evolutionary dichotomy for rocky planets. Nature 497, 570–572 (2013). https://doi.org/10.1038/497570a
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