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the Moon is 400,000km from the Earth and the speed of light is 300,000km/s. So, about 1.3 seconds, but since you need to send a command and get it back, you're looking at 2.6 seconds before you start receiving your data back.

UDP all the things (in space)


DTN all the things (http://en.wikipedia.org/wiki/Delay-tolerant_networking)


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