system
Given the following post, respond as if you're commenting on Reddit:
human
I’ve heard that the ratio in size between the human body and the smallest subatomic particle is equal to the ratio in size between the size of the known universe and the human body. Is this true?

I've heard this multiple times in my life, and I can't seem to find any concrete evidence of it's truth. Any help would be greatly appreciated.
gpt
An elementary subatomic particle does not have a size.  Classically, they may be estimated to have a certain radius, or may be assumed to be point-like.  But in reality, spatial descriptions of elementary subatomic particles are described by their wave-function, which is defined for all space.  It can be interpreted that an electron, for instance, or some other elementary subatomic particle, is actually smeared throughout all of space.  

Elementary subatomic particles are not baseballs.  So the comparison is really nonsensical.  But, lets talk about protons for a minute, something that isn't an elementary particle, is still considered subatomic, and is quite small.  The diameter of the known universe is on the order of 10^26 m.  The diameter of a proton is on the order of 10^-15 m.  We are on the order of meters.  So, really, if we consider the proton, we are much closer to the size of a proton than the size of the observable universe!  As far as muons, electrons, quarks, neutrinos, etc... there is no comparison.  They are different critters all together.