Scientists completed the largest neutrino detector with the lowering of the last of more than 5,000 neutrino sensors into holes (one shown) bored deep into the Antarctic ice sheet with hot water drills. The IceCube Neutrino Observatory will look for the high-energy particles as they collide with ice molecules.
Credit: NSF/B. Gudbjartsson
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By Leila Schneps and Coralie Colmez
Review by Janet Raloff
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