What observational evidence suggests that Uranus was struck by a large planetesimal early in its formation?
A. Uranus's moon Miranda shows a patchwork surface, suggesting a collision in its past.
B. Uranus's rotational axis is tipped over.
C. Uranus orbits the Sun in the opposite direction as the other planets.
D. Astronomers have identified a large impact crater on the surface of Uranus.
Answer: B
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