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According to Quanta Magazine (This article and its images were originally posted on Quanta Magazine January 7, 2019 at 11:52AM.)
In nearly two dozen underground laboratories scattered all over the earth, using vats of liquid or blocks of metal and semiconductors, scientists are looking for evidence of dark matter. Their experiments are getting more complicated, and the search is getting more precise, yet aside from a much-contested signal coming from a lab in Italy, nobody has found direct evidence of the mysterious material that is thought to make up 84 percent of the matter in the universe.
A new study suggests we should look deeper.
Dark matter is different from regular, baryonic matter — the stuff that makes stars, galaxies, dogs, humans and everything else — in that it does not interact with anything except through gravity (and perhaps the weak nuclear force). We can’t see it, yet physicists are all but certain it’s there, sculpting galaxies and their paths through the cosmos.
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