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Big Questions

The Nature of Dark Matter

Neutrinos are tiny particles that make up a small portion of dark matter. They are very small and light and rarely interact with normal matter. Neutrinos are produced in nuclear processes in stars, so they are constantly being flung out along with light and the solar wind. At this moment millions of neutrinos from our Sun are passing right through your body, but since they have no electric charge and much less mass than an electron they have no effect on you.


A service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/GSFC

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