Why are Earth and other planets spherical while smaller bodies such as most asteroids are not?
A. The larger mass of a planet produces enough gravity to pull it into a round shape.
B. It is the nature of massive objects to pull themselves into spherical shapes.
C. Asteroids were never molten, and so never underwent differentiation.
D. Earth and other planets formed from planetesimals pulled together by gravity into circular orbits.
E. The atmosphere of a planet is heavy enough to push the planet into a round shape.
Answer: A
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