fun fact that I probably shared before, but my university had a physics class called estimations of scale, where you did order of magnitude estimations, usually of things really large like galaxies or small like particles, and then put them into a scale that is intuitive and made sense to you to imagine. One person I worked with did the length of his dick for the length scale (though he used something else for homework he had to turn in, probably football fields). The milky way is ~1.7*10^17 dicks across apparently.