A Journey To The Oort Cloud, Where Comets Are Born

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The comet ISON, discovered by two amateur astronomers last year, will zoom past the Earth next fall. But where did it come from? Astronomer Andrew Fraknoi says a passing star could have flung the comet our way from the Oort Cloud, a distant realm of ice chunks at the outer limits of the solar system.

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Copyright NPR. View this article on npr.org.