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Comet Tempel 1

Light reflects from the nucleus of the Tempel 1 comet in this Hubble Space Telescope image taken in 2005. The potato-shaped nucleus, which appears starlike because it's too small for Hubble to resolve, is 8.7 miles (14 kilometers) wide and 2.5 miles (4 kilometers) long.

Photograph courtesy NASA, ESA, P. Feldman (Johns Hopkins University) and H. Weaver (Johns Hopkins University Applied Physics Laboratory)