Which of the following hypotheses for the origins of the Moon is generally accepted by astronomers?
A. The Moon is the result of a collision between Earth and a Mars-sized object in the early days of the solar system (the collision theory).
B. The Moon formed somewhere else and was later captured by Earth (capture theory).
C. The Moon formed alongside Earth (the twin theory).
D. The Moon was originally a bulge on Earth that was flung off by the rapidly spinning Earth (fission theory).
Answer: A
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