The visible light we see with our eyeballs - produced by electron transitions in atoms - has an energy of 2-3 eV; the atmosphere is transparent to them. It's mo

The visible light we see with our eyeballs - produced by electron transitions in atoms - has an energy of 2-3 eV; the atmosphere is transparent to them. It's mostly opaque to the reported energies, produced by the decay of the the nuclei of atoms. The universe is also opaque to these energies, because they interact with 'background photons' (and possibly electrons) in their travel. We're lucky that only a few 'make it through' (and require sensitive scopes to detect). https://science.sciencemag.org/content/320/5884/1752 https://science.sciencemag.org/content/320/5884/1752 (The energies in the new report are 10 times higher than those in the cited paper from 2008.)