Alien Supercivilizations Absent from 100,000 Nearby Galaxies

What I am reading: Orange whorls of star-warmed dust fill the Andromeda galaxy’s spiral arms in this false-color mid-infrared image from NASA’s WISE space telescope. Such images…, Alien Supercivilizations Absent from 100,000 Nearby Galaxies, https://www.scientificamerican.com/article/alien-supercivilizations-absent-from-100-000-nearby-galaxies/, http://www.instapaper.com/rss/238947/i35BSjISqVKnAGF4lqMOZltq2L0, Instapaper: Unread, ,

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