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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 detected, with great difficulty. One of the aspects that was resolved once neutrinos could be reliably detected was that neutrinos oscillate between 3 different types. This changing behaviour means that they must be travelling slightly slower than the speed of light, and they must have a rest mass (but incredibly small).Astrophysicists have done calculations of the number of neutrinos in the universe, and verified this against the experimental neutrino detector results. There just aren't enough neutrinos in the universe to account for the odd way that galaxies rotate.So physicists are now searching for 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.