The size of galaxies would probably be 10 times larger if the subatomic-scale differences imprinted on the dark matter halos at generation of the cosmic microwave background radiation were 10 times larger.
A subatomic particle, as used in physical sciences, is a particle that makes up an atom. A subatomic particle can either be an elementary particle or a composite particle made up of other particles (such as a proton, neutron, or meson), according to the Standard Model of particle physics. Radiation is the emission or transmission of energy through a material medium or across space in the form of waves or particles. electromagnetic radiation, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (particle radiation).
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