Why are there fewer craters on Mercury than on the Moon?

This is not my own guess. It's the best guess by scientists! Planetary scientists believe that the most likely reason is volcanic activity, early in the history of Mercury. That resulted in the resurfacing of some of the planet, covering the smaller craters. Mercury has large-crater density similar to the Moon's. read more

This is not my own guess. It's the best guess by scientists! Planetary scientists believe that the most likely reason is volcanic activity, early in the history of Mercury. read more

(Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.) Size: same as the Moon. read more