The graph below shows the composition of the entire Universe. That tiny 4% yellow slice? That’s all the baryons, electrons, gluons, leptons, mesons, muons, neutrinos, neutrons, photons, protons, quarks, tau particles and W/Z bosons that we know of. Everything else in the Universe? We have no idea. Let me say that again: 96% of the … Continue reading Unsolved: Dark Matter and Dark Energy