Comet Hartley 2 leaves a bumpy trail
Friday, July 15, 2011 - 10:30
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.