If all the material in the asteroid belt were to be combined to produce a planet, how big would it be?
A) about 1500 km in diameter, less than half the diameter of the Moon
B) only a few kilometers in diameter, similar to an average mountain on Earth
C) about the size of Earth, with a diameter of about 13,000 km
D) about the size of Mercury, with a diameter of about 5000 km

Question

Quizplus · Accepted Answer

The combined mass of all the material in the asteroid belt is quite small compared to Earth or the Moon. If all this material were combined into a planet, it would be significantly smaller than the Moon, with an estimated diameter of about 1500 km, making option A correct.

If All the Material in the Asteroid Belt Were to Be