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Web Extra: In search of Dyson spheres

A half-century of advancements in the search for E.T.s has led scientists to find ways to track aliens who might not want to be found.
RELATED TOPICS: EXTRATERRESTRIALS
Extraterrestrial signal
Astronomers have been hunting aliens for more than 50 years. In that time, detection methods have improved significantly, advancing from Frank Drake’s Project Ozma, all the way to modern attempts to find Dyson spheres —hypothetical machines built to surround a star and capture its energy.

How would astronomers know if they’d found such a monstrosity? It might look something like a strange star recently found using NASA’s Kepler telescope. KIC 8462852 dims in a way never before seen, however, astronomers still think it’s most likely surrounded by debris rather than alien megastructures.

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