A pale green interloper among the stars of Cassiopeia, Comet Hartley 2 shines in this four-minute exposure taken on the night of Sept. 28, 2010, by NASA astronomer Bill Cooke:Still too faint to be seen with the unaided eye, the comet was 18 million miles away from Earth at the time. Cooke took this image …
Here Comes Comet Hartley 2!

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