(See description below)
AMANDA Map of Neutrino Sources (Northern Hemisphere)
Sky plot of 815 neutrino events obtained from the point source analysis of data from the AMANDA (Antarctic Muon and Neutrino Detector Array) telescope. Horizontal coordinates are right ascension and vertical coordinates are declination. Also shown are the sky coordinates for ten potential high-energy neutrino sources.
Since neutrinos interact very little with matter, they alone of all particles can travel through the Earth easily. Therefore only particle traces traveling upward from the northern hemisphere to Antarctica are considered neutrinos. A neutrino passing through the ice occasionally collides with a water molecule, causing it to emit blue light. The light is sensed by an array of sensors buried in the ice of Antarctica. This array is the AMANDA telescope (see figure below).