Francis Halzen has won the 2026 Nobel Prize in physics. The prize recognizes his decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin. The U.S. National Science Foundation congratulated Halzen in a statement published October 6, 2026. The foundation said its investment in IceCube spanned more than two decades and covered design, construction, and ongoing operations.
IceCube's detectors sit more than two kilometers deep in South Pole ice
When IceCube was first proposed to NSF in the 1990s, it was an ambitious vision for a scientific facility unlike any other. Halzen and other scientists devised a plan to place thousands of digital detectors more than two kilometers deep in the crystal-clear ice of the South Pole. The location was chosen because it is ideal for spotting neutrinos. Neutrinos are often called ghost particles. They exist in great quantities but normally pass straight through Earth undetected. Detecting a single neutrino is a daunting challenge. IceCube was designed to detect many of them and to determine where they are coming from.
Construction started in 2004 at the NSF Amundsen-Scott South Pole Station, backed by the NSF-managed U.S. Antarctic Program. The observatory was built to catch many neutrinos, not just one, and to identify where they originate. IceCube began operations in 2011. Two years after operations began, the collaboration reported the highest-energy neutrinos ever observed. Their energy was more than a million times greater than that of earlier detections. That finding was the first evidence that neutrinos may regularly cross Earth from high-energy sources beyond the solar system.
IceCube traced neutrinos to a black hole and mapped the Milky Way
Analysis of IceCube data has continued to produce discoveries. In 2018, IceCube provided definitive evidence that neutrinos were coming from a supermassive black hole in another galaxy. In 2023, IceCube generated the first image of the Milky Way made from neutrinos. NSF high-performance computing facilities made many of these results possible. Scientists used those facilities to process the large volumes of IceCube data and to run simulations that sharpened the interpretation of measurements. Together the results have broadened what is known about the universe.
NSF funded IceCube for more than two decades
NSF's role went beyond building the detector. The agency invested in design, construction, and ongoing operations over more than two decades. That support covered the engineers, instrument builders, and field crews who worked at the South Pole. Brian Stone, performing the duties of the NSF Director, said foundational science and discovery requires extraordinary human grit from the dedicated engineers, instrument builders, and field crews who constructed and continue to operate a massive observatory a mile beneath the Antarctic ice. Stone said NSF is proud to support the IceCube collaboration and every individual in the U.S. Antarctic Program who helped turn this daring vision into reality.
NSF backs research facilities and instruments that allow scientists to explore nature in ways that would otherwise not be possible. IceCube is one of those facilities, and the prize recognizes what that investment produced. For a traveler planning an Antarctic voyage, the useful question to put to an operator is which current U.S. Antarctic Program science, including IceCube follow-up work, will be part of the voyage's lectures and briefings.