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

Question

Quizplus · Accepted Answer

Uranus' rotational axis is tilted at about 98 degrees, which is unusual compared to other planets. This extreme tilt suggests that a massive collision with a large planetesimal could have knocked the planet over early in its formation.

What Observational Evidence Suggests That Uranus Was Struck by a Large