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Gamma rays travel at the same speed (in a vacuum) as all Electromagnetic radiation, that is 2.99 792 458 x 108 m/s. There are 1000 metres in a kilometre, making 2.99 792 458 x 105 km/s. Since there are 3600 seconds in an hour gamma rays travel at 1.079252849 x 109 km/hr or 1,079,252,849 km/hr. (roughly a billion)

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13y ago

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