The elusive neutrino: a particle that passes through you by the millions
In short: Every second, roughly 100 million neutrinos stream through your thumbnail alone. These nearly invisible ghosts of the subatomic world are so abundant they permeate everything from the sun to your own body, yet they rarely interact with ordinary matter.
Neutrinos are among the most pervasive yet mysterious components of our universe. They are the second most abundant particles in existence, surpassed only by photons (particles of light). Because they lack significant electric charge and possess very little mass, they do not interact with matter through electromagnetic forces. Instead, they primarily interact via the weak nuclear force, making them incredibly difficult to detect and study.
The sheer scale of their presence is staggering. While about 100 million neutrinos pass through your thumbnail every second—mostly originating from the sun—the probability of a single interaction is remarkably low. On average, only one neutrino will actually strike an atom in your body over the course of an entire human lifetime. This lack of interaction means that when they do not hit anything, they remain effectively invisible to our current instruments.
Understanding neutrinos is central to answering fundamental questions about the cosmos. They are produced in a wide variety of environments, including nuclear reactions within the sun, the Earth's core, nuclear reactors, and particle accelerators. They even originate from common objects like bananas due to the radioactive potassium they contain. Scientists are currently investigating these particles to solve profound mysteries, such as why the universe exists at all, specifically looking into the balance between matter and anti-matter created during the Big Bang.
Determining a specific 'lifespan' for a neutrino is complicated by the principles of relativity. Because their lifespan can depend on an observer's frame of reference, the answer is not a simple constant but a complex calculation involving how we perceive time and motion in different states.
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Sources
- Summary by Intellect · source: What is the lifespan of a neutrino? | Even Bananas
- Also: Even Bananas - The Queen's College, Oxford
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