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SETI: November 2018


In 1974, the Arecibo Observatory made history by beaming the most powerful radio message into deep space ever made.

If extraterrestrial intelligence exists somewhere in our galaxy, a new MIT study proposes that laser technology on Earth could, in principle, be fashioned into something of a planetary porch light -- a beacon strong enough to attract attention from as far as 20,000 light-years away.