Looking down into one of the IceCube neutrino detector holes at the South Pole. IceCube is the world's largest neutrino detector. The size of the detector is important because it increases the number of potential collisions that can be observed, making neutrino astrophysics a reality. The observatory was completed in December 2010. While the observatory is managed by the University of Wisconsin-Madison and primarily funded by the U.S. National Science Foundation, Germany, Belgium and Sweden contributed to its construction. More than 250 scientists from 36 institutions in the U.S., the partner countries, and elsewhere are now analyzing the data collected by the observatory.