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For 50 years, astronomers have been watching in bafflement as a giant star flickers with powerful, erratic X-ray emission.

Now, we finally have observations detailed enough to confirm a long-held suspicion. The X-ray emissions from the massive…

Given the exponential rise in discoveries of exoplanets—with 6,000 and counting now identified—detecting signs of alien life has never been more of a needle-in-a-haystack exercise. But astronomer Lisa Kaltenegger and undergraduate students at…