Comet Hartley 2 leaves a bumpy trail

Monday, July 18, 2011 - 00:30 in Astronomy & Space

New findings from NEOWISE, the asteroid- and comet-hunting portion of NASA's Wide-field Infrared Survey Explorer mission, show that comet Hartley 2 leaves a pebbly trail as it laps the sun, dotted with grains as big as golf balls.

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