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August 25 2013
When it comes to detecting laser pulses aliens might shoot at Earth to attract our attention, scientists now find they can detect signals as faint as a single photon of light every few tiny fractions of a second.
Astronomers have gazed at the skies for decades searching for signs of extraterrestrial intelligence. Lasers can in principle help transmit messages over extraordinary distances, but while scientists have monitored a large number of stars looking for alien laser signals — for instance, facilities at Harvard and Princeton scanned more than 10,000 sun-like stars for several years — no evidence for any have been found yet.
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