234 civilizations

Aliens?

by Daniel Russ on August 14, 2017

  The Sloan Digital Sky Survey has created the most detailed three-dimensional maps of the Universe ever made, with deep multi-color images of one third of the sky, and spectra for more than three million astronomical objects.   Discovery of peculiar periodic spectral modulations in a small fraction of solar type stars E.F. Borra, E. Trottier […]

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