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Old 06 February 2014, 04:22 PM
A Turtle Named Mack's Avatar
A Turtle Named Mack A Turtle Named Mack is offline
Join Date: 21 June 2007
Location: Marietta, GA
Posts: 21,451

I will quibble with this one:
If an atom was the size of our solar system, a neutrino would be the size of a golfball, to scale.
An atom has size because it involves forces confining the particles in relation to each other (there is more to it, but that's good enough for now) but being unable to confine them to a superposition on each other for various reasons. The simple particles - neutrinos, quarks, electrons, etc. - do not definitively have a known size. We have tests that show they must be less than some awfully small size, but that is a limitation on the technology. It is believed, I am pretty sure, that the simple particles - those not composed of other particles, as far as is known - are literally infinitesimally small.
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