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Observational lower limit on Dyson Sphere Construction time
[Boyajian et al. (2015)](http://arxiv.org/abs/1509.03622) report that the star KIC 8462852 has undergone a recent series of rapid, significant dips in brightness which [Wright et al. (2015)](http://lanl.arxiv.org/abs/1510.04606) explain by suggesting the star is occluded by an 'alien megastructu...
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