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The Breakthrough Listen program has the most powerful SETI equipment on the planet, and access to the largest telescopes on the planet, we can look at The Breakthrough with greater sensitivity and for a wider range of signal types than any other experiment in the world. Related : Why is this star dimming ? Astronomers still don't know One farfetched theory about the star is that aliens are somehow responsible for the star’s dimming, perhaps by having built a structure that passes in front of it, although Dan Werthimer, the chief scientist at Berkeley SETI, said Andrew Siemion thinks that’s incredibly improbable.