A vast physics experiment built in a tunnel below the French-Swiss border is fast becoming one of the coolest places in the Universe. The Large Hadron Collider is entering the final stages of being lowered to a temperature of 1.9 Kelvin (-271C; -456F) - colder than deep space. The LHC has thousands of magnets which will be maintained in this frigid condition using liquid helium. The magnets are arranged in a ring that runs for 27km through the giant tunnel. (source: news.bbc.co.uk)
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