High-energy neutrinos, formed from violent astronomical events, were previously only found in galaxies with very active black holes. Now, researchers have seen an excess of neutrinos in the data from our own galaxy
For most of human history, observers had one tool to study the cosmos: their own eyes. And what they saw was our sun, the moon, the brightest planets, and the stars in the Milky Way tracing a thick band across the sky.
The IceCube neutrino detector, which sits 0.9 mile below the surface, hosts 5,160 basketball-size modules encased in a cubic kilometer of Antarctic ice. Each of those modules look for light signals created when particles interact with the ice.Neutrinos pass through most matter unscathed, although occasionally, one will interact with matter, initiating a series of events that physicists can see with their sensitive detectors. Of the handful that exist, IceCube is the largest.
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