The Large Hadron Collider (LHC) is one of the coldest places on Earth. The 1.9 K (-271.3 °C) operating temperature of its main magnets is even lower than the 2.7 K (-270.5 °C) of outer space. To get the LHC to this temperature, 120 tons of liquid helium flow around a closed circuit in the veins of the accelerator.
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Source: Phys.org