When did the Moon's craters form?

Answer 1

Comets and meteorites hitting it. It doesn't have an atmosphere, so things just hit it, and make craters. This doesn't happen to the Earth because we have an atmosphere, and it burns up comets and things so when it hits the Earth, it is too small to make a big effect or lots of damage.

Meteors colliding with the surface of the Moon cause the craters. Earth is also hit with small meteors daily but our Atmosphere burns most of them to dust before they hit. Without wind, water, or any other way to change the appearance of the Moon, these craters stay on the surface of the moon forever.

Early on in the history of the Earth and Moon, there was an unusual period of meteor bombardment and this created huge craters on both bodies. One is named the Early Bombardment and another the Late Heavy Bombardment, and information on both is in Wikipedia.

Strictly, a meteor is a small body that burns up in the atmosphere, and a meteorite is one that lands.

Answer 2

The Moon's craters formed over billions of years as a result of impacts from asteroids and meteoroids. The majority of the craters were formed during the Moon's early history, between 3 to 4 billion years ago during a period known as the Late Heavy Bombardment.

Answer 3

Mostly lunar craters are caused by impacts from rocks and other small space debris.

Answer 4

About 4.6 Billion years ago when the moon first formed. the process is still continuing today although much less often.