A planet is 1.3x10 km away from the earth to the sixth power. After the laser signal is sent from the earth to the planet, how many seconds can it receive the return signal?

The speed of light is 3 × 10 to the power of 5 km. It shoots out one distance, and then comes back another distance. There are two distances in total. 2 × 1.3 × 10 to the power of 6 ／ 3 ／ 10 to the power of 5 is about 8.667s

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