Where do neutrinos come from?

Everywhere! Neutrinos are a natural part of particle decay, when one particle transforms into another. Neutrinos can come from within Earth’s core, our sun, explosions of far-off stars, the Big Bang, reactions when particles interact in our atmosphere, or even reactions in your own body. Even bananas produce neutrinos. Scientists can also produce them using accelerator beams or nuclear reactors, creating a controlled source that is more easily studied.