IMPACTS: How Often?

Estimate by counting craters of a given size in the “younger” lunar surfaces (formed after heavy bombardment phase of solar system formation). Adjust for fact that Earth is bigger.
For craters > 50 km in size, expect one impact every ~10 million years!
Statistics: If you do a traffic survey, and count 6 cars every 60 seconds, expect 1 car every 10 seconds on average. BUT you wouldn’t let a car pass and step into traffic confident you have 10 seconds until the next car!
Expect smaller ones more frequently (OH table)

Estimate by counting craters of a given size in the “younger” lunar surfaces (formed after heavy bombardment phase of solar system formation). Adjust for fact that Earth is bigger.