Is Earth the only Goldilocks planet?

Humans have wondered about life in the universe since antiquity. Early Greek philosophers argued that the cosmos contained “a plurality of worlds.” Today we know that exoplanetary systems are indeed ubiquitous, but the question now is: How common are planets that can support life? In 2000, paleontologist Peter Ward and astronomer Donald Brownlee of theContinue reading “Is Earth the only Goldilocks planet?”

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