Given that Mercury, Mars, and some of the moons of the gas giants are covered with craters, why do we not see lots of impacts happening today?
A. Most of the impacts happen on the far sides of these bodies.
B. Gravitational interactions between planets and planetesimals ejected most of the larger debris.
C. We would, but the impacts have always happened at a very slow rate and built up over billions of years.
D. All the planetesimals have collided with planets already.
Answer: B
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Answer the following statement true (T) or false (F)
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