> nobody has yet proposed a reason that so much of the universe would be so oddly invisible to us. Whilst I don't claim to have an answer to this question, I s

> nobody has yet proposed a reason that so much of the universe would be so oddly invisible to us. Whilst I don't claim to have an answer to this question, I still wouldn't call it "odd". We know of four fundamental forces (strong, weak, electromagnetic and gravitational) and we know that some particles are unaffected by some of these; e.g. leptons don't feel the strong force and neutrinos don't feel the electromagnetic force. I would say the odd part is our assumption that matter should be visible (AKA electromagnetically interacting). (Note: I'm only talking about dark matter here; dark energy is odd ;) )