Question on Lorentz contraction and size of "pancakes" I have read that nucleons (protons in particular) appear to look like flattened "pancakes" hitting each other due to the lorentz contraction when crashed together at high speeds. Do any of the colliders give a hint at the "size" of the pancakes? Ie. At say 99.99% of the speed of light, protons must be within ??? picometers of each other to react with each other and create a "crash". This number is confussing as I understand the pancakes can also pass through each other without a collision.