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Are impactors more prevalent in the outer solar system than they are in the inner solar system? Does this affect how surface ages are estimated?

David Kaiser, Thornton, Colorado
RELATED TOPICS: ASTEROIDS
Plutosurface
Determining surface ages throughout the solar system helps explain the evolution of planetary bodies. To estimate the surface age, you need to know the number of craters and the number of impactors near that body. The former can be measured through spacecraft images, but what about the latter?

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