"An atom has a diameter of about 0.00000001 cm. The nucleus [at the centre] has a diameter of about 0.0000000000001 cm. If we had an atom and wished to see the nucleus, we would have to magnify it until the whole atom was the size of a large room, and then the nucleus would be a bare speck which you could just about make out with the eye, but very nearly all the weight of the atom is in that infinitesimal nucleus."
... Richard Feynman (1918-1988), theoretical physicist
... Richard Feynman (1918-1988), theoretical physicist