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Ask a Scientist: Size of Comet Hartley 2 - Transcript

Hi my name is Roberto, I'm in the 4th grade. My question is, is the comet Hartley 2 bigger or smaller than the average size of a comet?

Lori Feaga, EPOXI, Univ. of Maryland:
Hartley 2 is actually smaller than most of the comets we've been to with other spacecraft missions. It's about 1/5 of the size of comet Tempel 1, which was our primary target for Deep Impact.

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