Astronomy Quiz
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THE SOLAR SYSTEM
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An orbiter performs crater counts on two large Martian volcanic plains, Plain A and Plain B. For craters larger than 1 km in diameter, the density on Plain A is found to be 50±5 craters per million km2, while on Plain B it is 200±15 craters per million km2. Assuming the impact rate has been roughly constant during the relevant time period, which conclusion is the most scientifically sound?
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