Nature's ghosts are currently hurtling through your body by the trillions

Space · Published 31 October 2026 Swipe more like this →

In short: Trillions of subatomic particles are passing through you right now without leaving a trace. Known as neutrinos, these fundamental particles outnumber all the atoms in the universe, yet they remain some of the most perplexing and elusive inhabitants of our physical reality.

Neutrinos are fundamental particles, meaning they cannot be broken down into smaller components. They possess no electrical charge and nearly no mass, a combination that allows them to travel at almost the speed of light. Because they lack charge and interact so weakly with matter, they can escape extreme environments where even light struggles to emerge, such as dying stars.

Despite their abundance, neutrinos are notoriously difficult to study because they are only affected by gravity and the weak nuclear force. The weak force is approximately 10,000 times weaker than the electromagnetic force. Because of this, scientists never detect a neutrino directly; instead, they observe signals from other particles—electrons, muons, and taus—with which neutrinos interact.

These interactions led to the naming of three distinct 'flavors': the electron neutrino, muon neutrino, and tau neutrino. Remarkably, neutrinos can cycle between these flavors as they travel through space. This phenomenon is so complex that researchers at institutions like Fermilab continue to explore their identities, including theories regarding 'sterile' neutrinos and the 'seesaw' mechanism.

The neutrino was initially theorised almost one hundred years ago by Wolfgang Pauli, who also saw Enrico Fermi give it its title. The term translates from Italian as "little neutral one." While they are produced by unstable atoms decaying in the Earth's core or nuclear reactors, their ghostly nature makes them a primary frontier for solving mysteries of matter and energy.

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