"Nobel Prize in Physics".. Francis Halzen Opens a Cosmic Window of Ice

Belgian-American particle physicist Francis Halzen won the 2026 Nobel Prize in Physics yesterday, in recognition of his pioneering work in creating an observatory to detect some of the universe’s most elusive particles—high-energy neutrinos—and to study their origins. Halzen realized that ice in Antarctica could be used to track neutrinos, often referred to as “ghost particles” because of their ability to pass through Earth and our bodies without leaving a trace, interacting with matter only in extremely rare instances. Eva Olsson of the Royal Swedish Academy of Sciences said, “These messengers carry information from the cosmos. They open the door to distant galaxies and tell us about processes resulting from stellar explosions.” The Academy stated that the neutrino interactions collected by the IceCube observatory in Antarctica provide researchers with insights into how high-energy neutrinos are produced, and may even reveal previously unknown cosmic phenomena. Mark Pierce, chair of the Nobel Committee for Physics, said in a statement, “Francis Halzen led an international team of researchers and engineers who have provided us with a remarkable scientific tool.” He added, “His perseverance and scientific vision have paved the way for a new kind of astronomy.” In 2014, Smithsonian magazine named Halzen “the Neutrino Man” when it awarded him one of its Innovation Prizes, praising “an extraordinary experiment that paves the way for a new era in astronomy.” The magazine also published an illustrated story about his life titled, “How a Physicist’s Journey to Explore the Cosmos Began in Antarctica.”