<human>:  How many times has the moon been hit by a meteor?
<bot>: The moon has been hit by a meteor about a million times. The moon is constantly being bombarded by tiny particles of dust and debris from space. These particles are called meteoroids. Meteoroids are small pieces of rock and metal that are left over from the formation of the solar system. The moon is constantly being hit by these meteoroids, and the collisions cause small craters to form on the surface.