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Astronomy Picture of the Day

Visit the NASA/JPL website to view more Astronomy Pictures of the Day [1]


Ice Fishing for Cosmic Neutrinos
Credit: NSF [3] / B. Gudbjartsson, IceCube Collaboration [4]

Explanation: Scientists are melting holes in the bottom of the world. In fact, almost 100 holes melted near the South Pole [5] are now being used as astronomical observatories. Astronomers [4] with the IceCube Neutrino Observatory [6] lowered into each vertical lake a long string [7] knotted with basketball-sized light detectors. The water in each hole soon refreezes. The detectors attached to the strings are sensitive to blue light emitted in the surrounding clear ice. Such light is expected from ice collisions with high-energy neutrinos [8] emitted by objects or explosions out in the universe. Late last year, the last of IceCube [9]‘s 86 strings was lowered into the frezzing abyss, pictured above [10], making IceCube the largest neutrino detector yet created. Data from a preliminary experiment, AMANDA [11], has already been used to create the first detailed map [12] of the high-energy neutrino [13] sky. Experimental goals of the newer IceCube [14] include a search for cosmic sources of neutrinos, a search for neutrinos coincident with nearby supernova [15] and distant gamma-ray bursts [16], and, if lucky, a probe [17] of exotic physical concepts [18] such asunseen spatial dimensions [19] and faster-than-light travel [20].