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$\begingroup$ Interesting scenario in the second half - consider also violet (I may do a follow-up question on violet stars) or a spectral emission that wouldn't occur naturally (lines in the wrong places, etc). I digress. $\endgroup$
– Zxyrra
Commented Dec 13, 2016 at 5:44
$\begingroup$ Violet: some stars are blue-hot. Lines: indeed, small number of lines to keep power in small number of channels, but provide correlation for noise rejection. $\endgroup$
– JDługosz
Commented Dec 13, 2016 at 5:52
1

$\begingroup$ A similar situation occurs in The Mote in God's Eye, in which it is deduced that the Mote must harbor an alien civilization because it had turned green for a while, as a result of turning on the launching equipment for a laser-sail starship. $\endgroup$
– Logan R. Kearsley
Commented Dec 13, 2016 at 18:52

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