I have read this question:
I do understand that matter inside galaxies will not get stretched because inside galaxies, gravity dominates over dark energy. But this question does not talk about fermions traveling through expanding space.
I understand that photons traveling through the intergalactic voids of space where dark energy is dominant, and space expands, these photons' wavelength gets stretched as space expands, so their frequency gets smaller, and lose energy (redshift).
Now, I understand that we receive not only photons (bosons), but normal matter, fermions too (cosmic ray). Fermions like protons arrive on Earth from far away galaxies in the form of radiation.
Cosmic rays are a form of high-energy radiation, mainly originating outside the Solar System and even from distant galaxies. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface. Composed primarily of high-energy protons and atomic nuclei, they are originated either from the sun or from outside of our solar system.
Now as protons, that are made up of quarks, travel through intergalactic voids of expanding space, do these get stretched too?
Do we see bigger sized protons coming from far away galaxies?
Do fermions get stretched as they travel through expanding space? Have we ever observed anything like this?
Have we ever observed atoms or protons (cosmic ray) that traveled through expanding space that got stretched? Is the strong force stronger then dark energy?