Light pollution is not something to be terribly happy about. Researchers from Princeton and Harvard universities now suggest a seemingly more straightforward method to see who is out there by seeing who’s left the light on. Edwin Turner, a professor in Princeton’s Department of Astrophysical Sciences, and Avi Loeb, professor and chair of Harvard’s Department of Astronomy, have reported a technique that could detect alien civilizations by the artificial light that would emanate from their cities. Turner and Loeb’s work, which presents a mathematical algorithm to detect and observe this artificial light from Earth, has been submitted to the journal Astrobiology.

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