The nucleus of Comet Hartley 2, captured by the EPOXI mission. Credit: NASA/JPL-Caltech/UMD

Comet_hartley_2

The nucleus of Comet Hartley 2, captured by NASA's EPOXI mission from a distance of 435 miles (700 km). The comet's nucleus is 1.2 miles (2 km) long. Jets can be seen streaming from the nucleus. Credit: NASA/JPL-Caltech/UMD

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