Neutrinos are elementary particles with no electric charge and a tiny but nonzero mass. They interact so rarely with ordinary matter that most pass straight through it, earning them the nickname “ghost particles.” That nickname describes how elusive they are—not anything supernatural. Detecting the rare interactions they do make lets scientists investigate the Sun, distant cosmic events and fundamental questions about matter.
What is a neutrino?
A neutrino is an elementary particle: no smaller constituents are known to make it up. It belongs to the lepton family, which also includes the electron. Unlike an electron, a neutrino has no electric charge, so it does not interact through the electromagnetic force. It interacts through the weak force and gravity; because the weak force acts over very short distances, neutrinos can cross large amounts of matter without interacting.
Neutrinos are not massless. Experiments show that their mass is nonzero, but the exact mass is still unknown. Neutrinos and antineutrinos are distinguished in some experiments; whether a neutrino is its own antiparticle remains unresolved.
What are the three neutrino flavors?
The three known flavors are electron neutrinos, muon neutrinos and tau neutrinos. Each is named for the corresponding charged lepton that can be produced alongside it in an interaction. “Flavor” is a particle-physics term, not a reference to taste.
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How do neutrinos change flavor?
A neutrino’s flavor at detection can differ from its flavor when it was produced. This change is called neutrino oscillation. It happens because neutrino flavor states are connected to mass states in a way that allows the measured flavor to change as the neutrino travels. Observed oscillations establish that at least some neutrino masses are nonzero.
A historical example is CERN’s CNGS project, which sent a muon-neutrino beam 732 kilometers through rock toward the Gran Sasso laboratory in Italy. Experiments including OPERA and ICARUS looked for tau neutrinos appearing from that beam. CNGS is a past project, not an active beam; CERN’s CNGS overview describes its history.
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Where do neutrinos come from?
Neutrinos are produced in radioactive decay and nuclear reactions. Their sources include the Sun and other stars, supernovae, natural radioactivity inside Earth, nuclear reactors, particle accelerators and high-energy cosmic processes. The U.S. Department of Energy notes that naturally radioactive potassium in a banana emits neutrinos, too, although that is a small source beside the Sun.
NASA estimates that about 65 billion solar neutrinos pass through each square centimeter at Earth every second. The figure is a flux—particles per unit area per unit time—not a count for a whole person or object.
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Why are neutrinos so hard to detect?
Most neutrinos pass through a detector without a collision. Experiments compensate by using large amounts of target material and looking for the rare interaction that does occur. The neutrino itself is not usually seen directly: researchers detect secondary charged particles or radiation produced by its interaction.
Finding light from interactions in ice or water
When a neutrino interacts in water or ice, it can produce a charged particle. If that particle moves faster than light travels through that medium, it emits detectable light. This does not mean the particle outruns light in a vacuum; light travels more slowly through ice or water than it does in a vacuum.
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The IceCube Neutrino Observatory uses an array of sensors embedded in about one cubic kilometer of Antarctic ice to detect such light. Its large volume increases the chance of capturing evidence of a rare interaction. NASA explains the detector’s scale and role in “Sensing the Universe.”
Inferring neutrinos at a particle collider
At the Large Hadron Collider, neutrinos do not leave tracks that the detector can register directly. Instead, researchers infer their presence from missing transverse energy: an imbalance in the measured motion of particles produced in a collision. That imbalance can also be caused by other invisible particles, so it is a clue to interpret, not proof of a neutrino on its own. CERN Open Data’s neutrino guide describes this collider method.
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What can scientists learn from neutrinos?
How the Sun and other cosmic sources work
Neutrinos produced by nuclear reactions in the Sun’s core can escape from its dense interior and reach Earth. Because neutrinos interact so rarely, they can carry information from regions where light is trapped or scattered. High-energy neutrinos can also help researchers investigate powerful cosmic environments. They offer a complementary way to study the universe, rather than a replacement for observations using light.
How neutrinos behave and what they weigh
Oscillation experiments investigate how neutrinos change flavor and measure differences among their masses. To constrain the overall mass scale, the KATRIN experiment studies the energy spectrum of electrons from tritium beta decay, looking for the small effect of neutrino mass on that spectrum.
On April 7, 2026, the U.S. Department of Energy reported that the KATRIN collaboration’s analysis of 259 days of data placed the neutrino mass below 0.45 eV/c², or 8 × 10⁻³⁴ grams. This is an upper limit, not a measurement of the exact mass. The result and method are described in the Department of Energy’s KATRIN announcement.
Open questions in particle physics
Scientists are still investigating the ordering of neutrino masses, whether neutrinos are their own antiparticles and whether neutrino behavior could help explain why the universe contains more matter than antimatter. The last possibility is an active research question, not an established explanation.
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Further reading
For a more technical introduction, CERN’s “Neutrino Physics” lecture review covers neutrino properties, detection, oscillations, mass measurements and supernova neutrinos.
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