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Most of the impact basins---craters measured in hundreds of kilometers---were made during this time.
It is noteworthy that about the time the heavy bombardment ended, life took hold.
Impacts as large as the one that led to the demise of the dinosaurs in much more recent history were happening about once a month.Some of them have orbits that cross the orbits of the planets and moons.When they get close enough to a planet or moon, they will be pulled in by the large body's gravity and strike the surface at a speed of at least the escape velocity of the planet or moon, i.e., faster than a bullet.Careful studies of how the craters overlap other craters and other features can be used to develop a history or sequence of the bombardment on the moons and planets. Worlds with less volcanism or erosion or tectonic activity in their history will retain more impact craters since the planet formed.Worlds with more geological or erosional activity will have newer surfaces or craters that have been so worn away as to be unrecognizable.