The 2026 Nobel Prize in Physics has been conferred upon Francis Halzen, a groundbreaking Belgian astrophysicist whose efforts in constructing a massive Antarctic observatory to capture "ghostly" cosmic particles laid the groundwork for an "entirely new type of astronomy."

These minute, high-energy extraterrestrial particles, referred to as neutrinos, convey data that enables researchers to gain deeper insights into distant galaxies and exploding stars, as noted by Nobel committee member Eva Olsson during the award presentation on Tuesday at the Royal Swedish Academy of Sciences in Stockholm.

"Francis Halzen has led an international team of researchers and engineers who have provided us with a fantastic instrument," stated Nobel committee chair Mark Pearce.

"His tenacity and scientific vision has paved the way for a new kind of astronomy."

Reaching the Nobel press conference via telephone from Italy, the 82-year-old Halzen expressed that receiving the honor was a "great surprise" and "pleasure."

"When we started this project, everybody realized this was maybe a good idea but very few thought it would work, including myself," he remarked.

"So this was kind of an adventure where success wasn’t guaranteed."

The scholar, affiliated with the University of Wisconsin–Madison, initially outlined plans for the IceCube Neutrino Observatory in 1988, conceiving an extensive grid of optical sensors embedded deep within the Antarctic ice sheet to intercept neutrinos.

The facility leverages a fundamental characteristic of neutrinos—specifically, that they emit a faint burst of light upon colliding with an atomic nucleus, which can be tracked by optical detectors frozen inside pristine, transparent glacial ice.

Originating from the far reaches of the universe, neutrinos are frequently labeled "ghostly" due to their exceptionally elusive and volatile nature, passing through any form of matter without alteration.

Exhibiting virtually no mass and carrying no electrical charge, they traverse the most extreme environments—including stars, planets, and entire galaxies—completely unimpeded.

"It’s been a while since the Nobel Prize has gone to a single individual and that points to the uniqueness of his vision," observed Richard Fitzgerald, editor-in-chief of Physics Today, published by the American Institute of Physics.

"It took a team of hundreds of people to build it, but it all started with one person."

While billions of low-energy neutrinos are produced continuously by the sun, those originating from deeper space are exceedingly rare and far more difficult to detect.

During the 1980s, Halzen recognized that the Antarctic ice sheet provided an ideal medium to trap these mysterious particles; however, deploying delicate apparatus deep beneath the surface proved to be a formidable engineering challenge, requiring scientists to drill holes kilometers deep and lower arrays of light-sensing cables.

The precursor to IceCube, named AMANDA, reached completion in 2000 but failed to register the high-energy cosmic neutrinos Halzen sought, according to the Nobel Committee.

Subsequently, construction commenced on IceCube—a full cubic kilometer of instrumented ice equipped with 5,160 optical sensors distributed along 86 vertical cables—which achieved full operational scale in 2011.

In 2013, the research collaboration published its first evidence confirming the detection of cosmic neutrinos, and within two years, gathered sufficient observational data to conclusively prove the breakthrough.

The Nobel committee emphasized that IceCube will elevate neutrino astronomy to new heights, uncovering details about cosmic phenomena obscured behind impenetrable dust clouds and distant celestial structures like black holes.

Plans are currently underway to expand IceCube's reach to monitor an area spanning eight cubic kilometers of ice.

In the preceding year, the physics accolade was awarded to John Clarke, Michel Devoret, and John Martinis for their discovery of macroscopic quantum mechanical tunneling within electrical circuits, an advance that laid the technical foundation for quantum computing and related technologies.

The award includes a financial prize of 12 million Swedish kronor (approximately USD 1.2 million).

On Monday, the Nobel Prize in Physiology or Medicine was awarded to three scientists for developing a technique to decode the inner mechanisms of the human brain.

The Nobel announcements will continue Wednesday with the chemistry award, followed by the literature prize on Thursday.

The Nobel Peace Prize will be announced on Friday, culminating with the Nobel Memorial Prize in Economic Sciences on October 12.