The BEST estimate for the time of production of most craters on both Mercury and the Moon is
A) relatively recently, about 4 billion years after planet formation.
B) in the first 800 million years after planet formation.
C) about halfway through their lives, or about 2.3 billion years after planet formation.
D) at a relatively constant rate throughout their lives, up to and including the present day.
Correct Answer:
Verified
Q1: In 2011 a major event in the
Q3: Mercury can be seen easily from Earth
Q4: The albedo, or fraction of light reflected
Q5: Mercury appears from spacecraft photographs to resemble
Q6: Mercury has a very
A) dim magnitude when
Q7: Mercury, unlike the Moon, has large crater-filled
Q8: Why is it relatively difficult to observe
Q9: The Mariner 10 spacecraft was placed in
Q10: Why is Mercury difficult to observe from
Q11: Which one of these features is common
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