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JoshuaZ comments on Open Thread, Apr. 13 - Apr. 19, 2015 - Less Wrong
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A new study looking for signs of advanced civilizations finds that of a sample of 100,000 galaxies, there are no signs of a K-3 civilization. Study summarized here. The text of the actual study seems to be not yet available (at least I couldn't find it online). This is additional strong evidence for a Great Filter at a very worrying scale.