Nobel Prize in physics awarded to Francis Halzen for his work detecting ‘ghostly’ cosmic particles

Key Points:

• The 2026 Nobel Prize in Physics has been awarded to Belgian astrophysicist Francis Halzen for developing the IceCube Neutrino Observatory in Antarctica, which enables a new form of astronomy by detecting high-energy cosmic neutrinos.
• Neutrinos are nearly massless, electrically neutral particles that can travel through matter and extreme cosmic environments, providing insights into distant galaxies and exploding stars.
• Halzen's vision led to the creation of IceCube, a cubic-kilometer array of over 5,000 light sensors embedded deep in Antarctic ice, which first detected cosmic neutrinos in 2013, confirming their existence beyond the sun.
• The observatory allows scientists to study cosmic phenomena obscured by dust and distant objects like black holes, and plans are underway to expand IceCube to monitor eight cubic kilometers of ice.
• The Nobel Prize includes a cash award of 12 million Swedish kronor ($1.2 million), and the 2026 awards continue with announcements in chemistry, literature, peace, and economic sciences.