There is overwhelming evidence that dark matter makes up most of the matter in the Universe—researchers have even mapped its distribution on cosmic scales by observing how it stretches the images of distant galaxies. But we still don’t know what dark matter is. This unresolved puzzle is being tackled by direct-detection experiments that continue to break record after record with their sensitivities to feeble particle interactions. Today two leading dark matter searches—the XENON experiment under the Gran Sasso massif in Italy and the PandaX experiment at the China Jinping Underground Laboratory, the world’s deepest laboratory—publish analyses of their latest runs.
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