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(clever word i thought up for a 'nothing' particle )
which has the smallest possible mass (smaller than photons)
A Neutrino is almost a "nothing" particle - the Sun produces a lot of its energy in the form of neutrinos - and even at the orbital distance of the Earth, a billion of them pass through every square centimeter, every second. They pass through the bulk of the Earth almost without being affected.Neutrinos can be ...sorry, you cannot view external links. To see them, please
REGISTER or LOGINfor particles even more ghostly than neutrinos to account for dark matter. These particles could be all around us (and continually passing through us) without us noticing.