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Nobel Prize for Astrophysical Neutrino Observations with IceCube

7 October 2026

Congratulations to Francis Halzen (U. Wisconsin-Madison), winner of the 2026 Nobel Prize in Physics “for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.” 

The 22 September 2017 detection by IceCube of a high-energy neutrino from the direction of an active galactic nucleus (AGN) observed by Fermi-LAT to be simultaneously flaring in gamma rays provided the first evidence for an association between AGN and the sources of astrophysical neutrinos. 

IceCube’s work discovering and characterizing high-energy neutrinos of astrophysical origin has been foundational to the field. NASA is contributing to this field and flew the balloon-borne pathfinder Extreme Universe Space Observatory on a Super Pressure Balloon 2 (EUSO-SPB2) in 2023.

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This cropped horizontal image has layers of semi-opaque rusty red colored gas and dust that starts at the bottom right and goes toward the top left. There are three prominent pillars rising toward the top left. The left pillar is the largest and widest. The peaks of the second and third pillars are set off in darker shades of brown and have red outlines.