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An alien spaceship 8x10^14m away sends us a radio wave signal. How long does it take for the signal to reach us?
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An alien spaceship 8x10^14m away sends us a radio wave signal. How long does it take for the signal to reach us?

User Seth Battin
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Time = distance/speed

Time = 8•10^14m / 3•10^8m/s

Time = about 2.7•10^6 seconds.
That's about 31 Earth days.

User Bagira
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