Listen to the sound of ET communications received on Planet Earth

This paper presents evidence indicating that pulsar sky positions are nonrandomly distributed in a pattern that is not easily attributed to natural causes. As one example, between l ~ 32° to l ~ 57°, the number of pulsars progressively rises with increasing longitude until at the northern one-radian longitude point (l = 57.24°) their concentration drops precipitously by almost three fold, as if to mark this location. 

Compared with lower galactic longitudes, much of the higher pulsar population at these longitudes may be from observational bias due to the greater sensitivity of the Arecibo telescope, which has surveyed l ~ 39° to l ~ 69°. However, the progressive rise from l ~ 39° to l ~ 57° and abrupt drop off at this one-radian longitude cannot be attributed to such selection effects since it occurs at longitudes that lie well within the region covered by the Arecibo survey. 

On the other hand, if pulsars are ETI communication beacons, an obvious choice as a topic for communication would be to indicate the termination point of a one radian arc deviation from the Galactic center since such a geometrically unique off-center viewer-dependent location is not preferred by any natural process. 

Moreover designating this longitude indicates to us that the senders know the sky location of the Galactic center as seen from our vantage point, and hence that they intend their beamed message specifically for our particular Galactic locale.

Paul Laviolette


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