Dark matter does not mean "we are in the dark about this," at all. It's astronomy. It means "anything that is not shining like a star but we can detect it via

Dark matter does not mean "we are in the dark about this," at all. It's astronomy. It means "anything that is not shining like a star but we can detect it via inference." Light matter is stars. Dark matter can include MACHOS: neutron stars, black holes, brown dwarfs, rogue planets. No new physics required for MACHOs, as opposed to WIMPs.