Indeed, some of the ejecta would have smacked into Earth; other bits probably traveled across the inner solar system, cratering
planets and burning up in the Sun.
occurs, some kind of low surface tension contaminant is on the substrate, in the paint, or has fallen on the paint.
Textbooks often illustrate the concept of cratering
by depicting the impact, excavation, and ejection events on a completely flat terrain.
Also, he notes, similar simulations should shed light on the cratering
rates on other celestial objects with atmospheres, such as Venus, Mars, and Saturn's moon Titan.
But those chronologies are suspect until we get samples of the rocks to provide "ground truth" for each cratering
record on Earth isn't much better: Erosion and faulting obliterate traces of impacts.
THE MOON IS GEOLOGICALLY SIMPLE--it has impact cratering
and volcanism, and everything else is related or a footnote.