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Originally Posted by effektz
To the OP, very interesting theory for sure.
It's the same as sound waves. Sending radio waves into space aliens could pickup on them if they have the correct receivers, but they wouldn't hear the message until it got to them. So if they're hundreds of light-years away, a message we sent in 1708 would just now be getting to them. I don't know the exact science on the light thing but if it worked the same way that would be very interesting.
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Radio and light are just different frequency ranges.