A powerful laser 'porch light' could let aliens know where we are

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…
Source: Engadget | A powerful laser 'porch light' could let aliens know where we are