Shadow Blaster Galaxy Shot Neutrinos at South Pole

A star-forming galaxy nicknamed Shadow Blaster shot a high-energy neutrino toward Earth, where it crashed into the ice at the South Pole after an 11 billion-year journey through space.

In 2021, the NSF IceCube Neutrino Observatory in Antarctica detected a high-energy neutrino event, dubbed IC 210922A, arriving from the direction of the constellation Eridanus. IceCube alerted the scientific community, and multiple teams scrambled to find a source, scanning that region of sky with gamma-ray, X-ray and optical telescopes. None found a convincing explanation.

Yuji Urata and Kuiyun Huang led the team that traced the neutrino's origin to a submillimeter radio source spotted in JCMT archival data from Maunakea, Hawai'i. Their ALMA follow-up resolved it as a dusty, star-forming galaxy in the early universe, its light amplified and distorted by a closer galaxy sitting along the line of sight.

Shadow Blaster glows strongly at submillimeter wavelengths while remaining nearly invisible in visible light, which is exactly why the first wave of telescopes missed it. Its compact core is packed with dense gas and dust fueling an intense burst of star formation, a region long theorized to function as a powerful particle accelerator. If the link holds, it would mark the first time a star-forming galaxy has been directly connected to a high-energy neutrino event.

The broader implication: high-energy neutrinos may come from more than one kind of cosmic engine. Supermassive black holes remain part of the story, but they may not have to carry it alone.

The particle crossed 11 billion light-years, threaded through the entirety of the observable universe, and announced its origin by disappearing into a block of Antarctic ice. As calling cards go, it is both extravagant and entirely illegible without the right instruments.

Read the full story at Sky & Telescope, June 18, 2026

Hot Take: "Shadow Blaster" is either the most metal name in the history of astronomy or a strong argument that scientists should be kept away from PR decisions.