Space/Science — HabitableZone

Space/Science » in reply to re: not directly beamed

Who says that ETI will use radio signals?

Let's not forget Optical SETI, which was briefly popular in the early 1960s and revived in the late 1990s:

http://www.coseti.org/content1.htm

As for other methods ETI might use to contact us, see here:

http://www.coseti.org/lemarch1.htm

http://www.setileague.org/editor/lde.htm

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