Well, but it has been. Just indirectly. But we have only measured tons of things indirectly, so that's nothing special. Like what Earth's core is made of, or th

Well, but it has been. Just indirectly. But we have only measured tons of things indirectly, so that's nothing special. Like what Earth's core is made of, or the fact that exoplanets exist, or that atomic nuclei are made of things called protons and neutrons, which in turns are made of things called quarks. Us humans are really biased towards giving a special importance to EM radiation, due to how important vision is to us, but that's just us. Nature does not care. "Laypersons" just never seem to know anything about dark matter, including the shitload of evidence from several different types of observations that there's something there that can't be explained by just tweaking some equations. Of course that never stops them from having an opinion based on a total strawman.