An MIT researcher claims a laser space beacon detectable up to 20,000 light years away is feasible -- essentially acting as a porch light for extraterrestrial life. James Clark's study posits that focusing a one- to two-megawatt laser through a 30- t... 
https://ift.tt/2DrIkta Kris Holt November 06, 2018 at 12:00AM
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