THE strangest telescope in the world has seen something at last – but it’s not clear what. At the conference last week, a new map of the universe was unveiled by Francis Halzen of the University of Wisconsin-Madison. The map is a picture of the sky in high-energy neutrinos, each with trillions of times the energy of a visible photon.
The neutrinos were detected by AMANDA II, an array of 667 detectors buried deep under the South Pole (Â鶹´«Ã½, 7 December 2002, p 42). When a neutrino hits an atomic nucleus in the ice, it produces a particle called…
