The Collision of the Deep Impact Probe with the Nucleus

question 157

Multiple Choice

The collision of the Deep Impact probe with the nucleus of Comet Tempel 1 in 2005 revealed the nucleus as a "rubble pile," held together by

• A) cohesive forces much stronger than those holding rocks together on Earth.
• B) frozen ices.
• C) gravitation.
• D) a fusion crust.

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