南极冰层下的中微子观测站，追踪宇宙最微弱的信号
Deep beneath the Antarctic ice, a cubic kilometer of frozen water has been transformed into the world’s strangest telescope. The IceCube Neutrino Observatory, buried at the South Pole, does not look for light or sound — it hunts for ghostlike particles called neutrinos. These nearly massless messengers zoom through the Earth as if it were empty space, carrying clues from exploding stars and distant black holes.
Neutrinos are notoriously difficult to catch. Every second, trillions pass through your body without leaving a trace. IceCube traps them by waiting for a rare collision with an ice atom. When that happens, a flash of blue light, known as Cherenkov radiation, reveals the neutrino’s path. A grid of over 5,000 sensors frozen deep in the ice records each faint spark.
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