Physics · announced Tuesday, 6 October 2026
A telescope frozen into the South Pole
“for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin”
- Francis Halzen b. 1944, Tienen, Belgium · University of Wisconsin–Madison
In plain terms
Neutrinos are particles with no electric charge and almost no mass. They pass through nearly everything. Trillions go through your body every second, most of them from the Sun, and you never know it. That makes them superb messengers and very hard to catch. A neutrino made beside a black hole in another galaxy will cross the universe in a straight line and then cross the Earth as well.
Francis Halzen’s idea was to use a detector so large that a few would be caught anyway, and to let nature supply it. Deep Antarctic ice is dark and extremely clear. On the rare occasion that a neutrino strikes an atom in the ice, the collision throws off a charged particle that leaves a faint trail of blue light. IceCube is 5,160 light sensors on 86 cables, lowered into holes melted with hot water and then frozen in place. Together they watch a cubic kilometre of ice.
In 2013 the collaboration reported the first high-energy neutrinos known to come from beyond the solar system. Since then IceCube has traced neutrinos to a distant galaxy with a giant black hole at its centre, to a second active galaxy 47 million light-years away, and to our own Milky Way. This starts to answer a question that has been open for more than a century: where cosmic rays, the most energetic particles ever observed, come from.
- 1980s
- Halzen begins work on catching neutrinos in polar ice.
- Mid-1990s
- A smaller array, AMANDA, shows the ice is clear enough.
- 2004–2010
- IceCube is built over seven Antarctic summers, for $279 million.
- 2013
- First high-energy neutrinos from beyond the solar system.
- 2017
- A neutrino is traced to a black hole in a distant galaxy.
- 2022–23
- Neutrinos from a nearer active galaxy, then from the Milky Way.
Say it accurately
- “Ghost particles show there is an unseen spiritual world.”
- Neutrinos are ordinary matter, counted and measured by ordinary physics. Unseen is a different category from immaterial. Use them as a picture of how much escapes our senses. They are no evidence for spirit.
- “He discovered the neutrino.”
- Neutrinos were predicted in 1930 and first detected in 1956, and earlier Nobel Prizes have honoured neutrino work. This one is for finding neutrinos of very high energy arriving from far outside the solar system, and for building the instrument that could find them.
- “IceCube sees neutrinos.”
- It sees the flash left when one happens to hit something. Nearly all of them pass through the ice as they pass through everything else, which is why a cubic kilometre is needed to catch a few.
- “One man’s triumph.”
- Halzen is the first to win the physics prize alone since 1992, but IceCube is the work of an international collaboration of more than forty institutions. The science prizes can only go to individuals. Halzen said he hoped the award would reflect on “the really courageous people who joined me in the beginning.”
- “This tells us how the universe began.”
- News reports say neutrinos offer clues to how the universe evolved. The finding itself is narrower. It identifies some of the places where nature drives particles to extreme energies. It is not evidence about creation or the Big Bang.
For preaching
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Long, costly attention Instance
Habakkuk 2:3 · James 5:7–8 · Luke 15:8–10
An idea in the 1980s, a trial in the 1990s, seven polar summers of building, a discovery in 2013. Three decades and hundreds of people, to catch a few particles, with no practical use in view. It is a real case of sustained hope, and of a community deciding that knowing something true is worth the cost. Halzen is 82. He was at work on a new proposal when Stockholm called.
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A voice that is not heard Likeness
Psalm 19:1–4
Astronomers now speak of “messengers” from the sky: light, gravitational waves, neutrinos. The psalm has the heavens declaring without speech, in a voice that goes out through all the earth. Neutrinos do go through all the earth, quite literally.
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Stillness as the condition of hearing Likeness
1 Kings 19:11–13 · Psalm 46:10 · Psalm 139:7–12
The instrument works because it is buried where nothing else is happening. No daylight, no noise, and ice so clear that one faint flash carries a long way. A faint signal needs quiet around it.
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The witness that arrives undeflected Likeness
John 1:6–8 · Isaiah 55:10–11
Cosmic rays carry electric charge, so magnetic fields bend their paths and their origin is lost. Neutrinos carry none and point straight back to where they were made. That is a picture of testimony: the worth of a witness is that it points back truly to its source.
On the Wesleyan shelf
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A Survey of the Wisdom of God in the Creation (1763, enlarged 1777)
Wesley compiled the natural science of his day for Methodist readers so that it would serve wonder and praise. His preface sets a rule a preacher can borrow whole: he sets out “not to account for things” but “only to describe them.” Say what was observed. Be slow to say what it means.
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The Imperfection of Human Knowledge (sermon on 1 Corinthians 13:9)
Wesley walks through the heavens, light, the air and the earth to show how little we understand even of what we can see. The first lesson he draws is humility; the others are trust in God and resignation. A particle that passes through us by the trillion and went undetected until 1956 belongs in that sermon.
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On the Discoveries of Faith (sermon on Hebrews 11:1)
Wesley starts from the old maxim that nothing is in the understanding that was not first in the senses, and argues that the senses cannot reach the invisible world. Keep the line where he drew it. Neutrino astronomy extends the senses with an instrument. It stays wholly inside what Wesley assigns to sense and reason, and is no example of what he means by faith.
Sources: Nobel press release · UW–Madison · IceCube Observatory · Scientific American · Al Jazeera