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The star alpha centauri is 4.3 light years away. If a spacecraft could travel at a speed v = 0.95c, how long would an earth

The star alpha centauri is 4.3 light years away. If a spacecraft could travel at a speed v = 0.95c, how long would an earth observer say a trip to that star would it take?

Use the formula of t'= t/1-v/c

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