... Tonight's Sky . ... Observing . ... IceCube pushes neutrinos to the forefront of astronomy . ... Analysis revealed the first high-energy neutrino flux ever observed, a highly statistically significant signal more than 4 sigma that meets expectations for neutrinos originating in cosmic accelerators. ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...