Periodic Spectral Modulations Arise from Non-random Spacing of Spectral Absorption Lines

2 Jan 2019Michael Hippke

In recent publications, Borra (2013); Borra & Trottier (2016); Borra (2017) claimed the discovery of ultra-short ($10^{-12}\,$s) optical pulses originating from stars and galaxies, asserted to be sent by extraterrestrial intelligence. I show that these signals are not astrophysical or instrumental in nature, but originate from the non-random spacings of spectral absorption lines... (read more)

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