Belgian physicist Professor Francis Halzen has earned the 2026 Nobel Prize in Physics for leading the development of IceCube, the world’s largest neutrino observatory.
IceCube uses a cubic kilometer of Antarctic ice at the South Pole equipped with thousands of optical modules that detect faint flashes of blue light when high‑energy neutrinos interact within the ice.
These neutrinos—often called “ghost particles” because they pass through matter virtually unimpeded—carry information from violent cosmic events, such as supernovae or black‑hole mergers, across billions of light‑years to reach Earth.
The Royal Swedish Academy of Sciences praised Halzen’s vision and scientific leadership as fundamental to IceCube’s success, noting that the detector has now produced a steady stream of new astrophysical insights.
Halzen first presented his South‑Pole neutrino concept in 1988; two decades later the IceCube collaboration, involving scientists from around the world, opened the telescope and continues to expand into new scientific territories every week.
