Photo: Comet Swarm Delivered Earth's Oceans?



"We may sip a piece of [a comet] every time we drink a glass of water," write the authors of an August 2009 study that suggests icy comets delivered Earth's oceans around 3.85 billion years ago. Above, a comet slams into what is now Chesapeake Bay in an artist's conception.

Photograph courtesy Nicolle Rager-Fuller, NSF


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