What did we learn from the Deep Impact mission to Comet Tempel 1 in 2005?
A) A comet of this size can be completely shattered by a rather minor impact.
B) Comet nuclei are highly radioactive.
C) The dust thrown up by the impact showed evidence of organic molecules.
D) The mission''s success or failure to collect samples will not be known until the spacecraft returns to Earth.
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