The Royal Swedish Academy of Sciences awarded the 2026 Nobel Prize in Physics to Belgian-born scientist Francis Halsen, a professor at the University of Wisconsin-Madison in the United States, on Tuesday, October 6, in recognition of his "decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin."
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The prize recognizes a scientific career that helped open a completely new window to the universe, not using light or radio waves as we are used to reading, but with highly elusive particles called "neutrinos".
These particles are generated from nuclear processes, such as those that occur inside stars in giant stellar explosions , or in nuclear reactions on Earth or particle collisions.
But this very property that makes detecting neutrinos difficult is the same property that gives them exceptional value to astronomers, as they can travel across enormous cosmic distances without scattering or losing much of their original information.
This is where Halzen’s idea came from. In 1988, he proposed using the deep ice in the South Pole to build a huge neutrino detector. When one of these particles collides, in rare cases, with an atomic nucleus, the collision produces charged particles that emit a weak flash of light that can be detected by highly sensitive sensors.
The idea later evolved into the IceCube observatory, a huge network of optical probes buried inside about a full cubic kilometer of clear polar ice. The observatory was completed in 2011, and then began to capture ultra-high-energy neutrinos that could not be explained by sources close to Earth.
A few years later, scientists were able to confirm that some of these neutrinos came from outside the solar system, in a discovery that effectively laid the foundations for what is now known as "high-energy neutrino astronomy".
The significance of the prize stems from the fact that the universe contains natural particle accelerators far more powerful than any human laboratory, yet the nature and mechanisms of these sources remain largely unknown. By tracking neutrinos, scientists hope to gain insights into violent environments such as active black holes, stellar explosions, and cosmic ray sources.
Over the past few decades, astronomers have collaborated to gather information from several different sources, including light in all its visible and invisible ranges, as well as gravitational waves and neutrino particle observations, to build a new type of observation called "multi-messenger astronomy," as if light in its visible and invisible forms is a messenger conveying a message from space, gravitational waves are another messenger that can be picked up by observatories such as LIGO, and neutrinos are a third messenger picked up by observatories such as IceCube.
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