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Data from NASA's Lunar Reconnaissance Orbiter (LRO) have revealed the Moon's "turbulent youth", during which it was pounded by "two distinct populations of asteroids or comets". The agency has put together a "detailed global topographic map" of our satellite, captured by the LRO's Lunar Orbiter Laser Altimeter (LOLA), showing …
Whenever you see anything about the early Earth and Moon on the telly, they usually show some animation of fireballs coming down every couple of seconds. In fact the figures for major hits were more like one a century. It's just that there were a lot of centuries in the bombardment period.