The size of the largest asteroid, Ceres, compared with the largest mare or impact basin on the Moon, which covers about one-quarter of the Moon's face, is
A) not comparable because all asteroids are very small objects (1 km diameter), whereas most maria are large (100-1000 km diameter).
B) much smaller, only about 1/3 the size.
C) very similar, about 1000 km across.
D) much larger, by a factor of more than 2.

Question

Quizplus · Accepted Answer

Ceres, the largest asteroid in the asteroid belt, has a diameter of about 940 kilometers, making it very similar in size to the largest mare or impact basin on the Moon, which can also span about 1000 kilometers across.

The Size of the Largest Asteroid, Ceres, Compared with the Largest