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If a typical hydrogen atom in a collapsing molecular-cloud core starts at a distance of 10,000 astronomical units, or AU (1.5 x 10^12 km) from the core’s center and falls inward at an average velocity of 1.5 km/s, how many years does it take to reach the newly forming protostar? Assume that a year is 3 x 10^7 seconds.

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