Which of the following hypotheses about the formation of the Moon was supported by lunar materials brought back to Earth by the Apollo astronauts?
A. It was formed from debris that coalesced following a collision between Earth and another planetoid.
B. It was a planetoid captured into Earth's orbit.
C. The moon was "spun" off from Earth during a time when Earth's rotation was much greater.
D. The moon and Earth formed together from the same from the same cloud of dust and debris.
Answer: A
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