Suppose that Mercury grew to its present size in 1 million years through the accretion of particles averaging 100 g each. On average, how many particles did Mercury capture each second? (Note: Mercury has a mass of 3.3 × 10 23 kg and a radius of 2,439 km.)   a. about 24 particles per second   b. about 3.3 × 1021 particles per second   c. about 67 particles per second   d. about 100 million particles per second   e. about 100 billion particles per second

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