For centuries, astronomers have relied mainly on light to study the universe. But scientists now have another way of looking into the cosmos — by tracking tiny particles known as neutrinos. That new approach has been central to the work of Belgian-American physicist Francis Halzen, who was awarded the 2026 Nobel Prize in Physics on Tuesday for his decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin. IceCube, located