On the day that researchers lowered the final detector of the IceCube Neutrino Observatory into a 2.5-kilometre-deep hole, the Antarctic sun was nearly as high as it gets and the temperature a balmy ?23?°C. “It is quite warm,” reported team member Albrecht Karle, a physicist at the University of Wisconsin in Madison. Just a week before the 18 December event, he adds, temperatures had averaged about 10?°C colder.
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