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When a neutrino interacts with molecules in the clear Antarctic ice, it produces secondary particles that leave a trace of blue light as they travel through the IceCube detector. (Nicolle R. Fuller, IceCube/NSF)

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A neutrino interacts with molecules in the clear Antarctic ice, produceing secondary particles.

When a neutrino interacts with molecules in the clear Antarctic ice, it produces secondary particles that leave a trace of blue light as they travel through the IceCube detector. (Nicolle R. Fuller, IceCube/NSF)