NEUTRINOS.
Where do neutrinos exist?
DOE Explains...Neutrinos | Department of Energy
Neutrinos are the most abundant particles that have mass in the universe. Every time atomic nuclei come together (like in the sun) or break apart (like in a nuclear reactor), they produce neutrinos. Even a banana emits neutrinos—they come from the natural radioactivity of the potassium in the fruit.
What is inside a neutrino?
A neutrino is a particle!
It's one of the so-called fundamental particles, which means it isn't made of any smaller pieces, at least that we know of. Neutrinos are members of the same group as the most famous fundamental particle, the electron (which is powering the device you're reading this on right now).
What are the sources of neutrinos on Earth?
Sources
Accelerators.
Reactors.
Beta decay.
Earth.
The sun.
The Big Bang.
The atmosphere.
Supernovae.
Do neutrinos have a purpose?
 Neutrinos are believed to be a vital ingredient in a star's supernova process. These explosions spread heavy elements throughout space, elements that are needed to create the universe we live in.
Neutrinos are the most abundant particles that have mass in the universe. Every time atomic nuclei come together (like in the sun) or break apart (like in a nuclear reactor), they produce neutrinos. Even a banana emits neutrinos—they come from the natural radioactivity of the potassium in the fruit.
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