What do they do? Are they just floating around?
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Neutrinos make up 3 of the 12 ‘matter’ particles (also called fermions). They are created in vast quantities by nuclear reactions such as the fusion in the sun. They are small… really small. You know how an electron is supposed to be small? Neutrinos are 500,000 times smaller. In fact, they were thought to have no mass or a while. And yes, they are just flying around everywhere. About 65 billion of them pass through every square centimeter every second. But they are so ridiculously tiny that they have almost no effect on anything.
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