http://inspirehep.net/record/1382926?ln=en PRL, 8 pages, 4 figures +supplementary material most neutrinos IceCube detects originated locally---e.g. from cosmic ray particles hitting Earth's atmosphere. But extra high energy neutrinos are more likely to come from outside solar system. As I understand it, they've been finding some rare ones that don't even come from in the plane of the Milkyway galaxy. http://nycity.today/content/284365-existence-cosmic-neutrinos-confirmed-help-antarctic-icecube-neutrino-observatory [Broken] rightly or not the headline in this popular media says "existence of cosmic neutrinos confirmed..."