Sitting a mile below ground in an abandoned gold mine in South Dakota is a gigantic cylinder holding 10 tons of purified liquid xenon monitored by more than 250 scientists around the world. That tank of xenon is the heart of the LUX-ZEPLIN (LZ) experiment, an effort to detect dark matter – the mysterious invisible substance that makes up 85% of the matter in the universe. The LZ uses helium gas as a part of the process - a carrier gas in the gas charcoal chromatography.
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