I wrote last month about recent reports on the failure of two major experiments named LUX and PandaX-II to directly detect dark matter and what that might mean for the prospects of alternate theories to explain anomalous gravitational effects. Of course, concluding that dark matter is non-existent is a tricky call since we don’t really know what it is made of and the negative results so far may well be due to the lack of sufficient sensitivity of the detectors or that dark matter is made of something quite different from what the detectors are designed to register.
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