> I wonder how much power you need to transmit with to be heard that far 
> away?
> 
> I mean isn't the transmitter on Voyager or whatever about to go out of 
> range, and that's only just left our own solar system!

I think if you could make the signal directional enough, you might not 
need that much power.

Isn't that one of the unusual properties of lasers? They can travel 
great distances without the beam spreading very much?

On the other hand, I wonder how much noise the signal has to be detected 
over?

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