Image of the Day: close-up of a comet

Here's a rare close-up of a comet. Hartley 2, to be exact. Named after Malcolm Hartley, the Australian astronomer, "who first identified the body in a photographic plate from a sky survey undertaken in 1986." NASA's Deep Impact probe and Hartley 2 crossed paths about 23 million km from Earth and was only the fifth time a comet has passed so close to a spacecraft.


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