If a neutrino do not interact with anything and can pass through a light year of lead, how humans manage to detect them?
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What would be the chance hitting the bulls eye if you put a darts board on its back next to the Empire State Building and threw a single dart of the observation deck?
It would be pretty much zero. Same as finding a single neutrino.
But if you would throw billions and billions of darts of the building, eventually one would land by chance in the bulls eye.
Neutrino detectors work the same. Literally gazillions of neutrinos pass through, but only a few hit the core of a heavy water atom, generating a detection event.
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