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Originally Posted by TLAM Strike
Radio and Microwaves are light.  |
Electromagnetic energy actually, which includes visible "light". All have different frequencies which affect propagation.
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Space is a wonderful medium for radio signals. Those involved in SETI seem confident that the signals we sent on purpose to some near by stars could be read if someone was there.
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I was reading somewhere awhile back that there is some doubt that those signals could be distinguished from background noise.