When our planet first formed, it was extremely dry. Something had to happen to deliver quintillions of gallons of water to Earth.
Each time you take a sip of water, you’re imbibing liquid that, in all likelihood, is up to 4.5 billion years old. Earth is awash in a life-sustaining substance about as ancient as the planet itself. Astrophysicists don’t completely know where the stuff came from, but circumstantial evidence suggests that water-containing meteorites might have pummeled an infant Earth. Those rocky showers would have helped transform a bone-dry place into a unique wet world. Or, at least, a damper one.
Raymond estimates that about a single ton of carbonaceous space rocks, rich in ice and watery minerals, could have delivered 110 to 220 pounds of water to Earth. When Jupiter and Saturn's masses “grew big really fast,” he says, the gas giant kicked those rocks toward the sun and the inner planets. Comet 67p documented by the European Space Agency's Rosetta spacecraft during the first mission to pull off a comet landing. This image was taken on January 31, 2015.
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