An mage of the Earth acquired with the OSIRIS narrow-angle camera aboard the  European Space Agency's comet chaser Rosetta from a distance of 393,000 miles.  This was Rosetta's fourth planetary swingby and the third and final swingby of Earth. (AP Photo/European Space Agency)

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An image of the Earth acquired with the OSIRIS narrow-angle camera aboard the European Space Agency's comet chaser Rosetta from a distance of 393,000 miles. This was Rosetta's fourth planetary swingby and the third and final swingby of Earth.

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