Ghost particle detectors

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Neutrinos are extremely small and fast, so much so that to detect them you have to build really amazing experiments, such as the ones shown here. Japan’s Super-K is a 50,000 ton tank of water, half a mile underground, so clear that divers get vertigo. The latest South Pole neutrino telescopes, which point into the earths core rather than at the sky, have arrays of detectors which are much larger than the Empire State building and are frozen deep in the Antarctic ice core.

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