The radius of our galaxy is 3 1020m how much time would


The radius of our galaxy is 3 *10^20m

(a) How fast would a spaceship have to travel to cross the entire galaxy in 300 yr, as measured from within the spaceship?

(b) How much time would elapse on earth during the traversal?

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Physics: The radius of our galaxy is 3 1020m how much time would
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