Comment by t8sr
13 hours ago
I’m admittedly a few years out of date in this, but weren’t those already kinda ruled out? I’ve never met anyone who took MOND seriously - it looks like it’s a pet project of a small number of people who cite each other, and people in different subfields have always been saying it doesn’t work for them (diffuse galaxies, etc.).
I know the current models favor cold DM, I thought the hot DM model was abandoned already when it became clear that clusters of any size exist?
Your assessment is spot on, but for whatever reason it's extremely popular with amateur physicists. The HN crowd likes it a lot, too. Almost every thread about dark matter has at least one comment that goes like "I'm not a physicist but dark matter always seemed like a cop out to me and will go the way of the luminiferous aether". I'm surprised that we're not seeing them here, perhaps because MOND can't explain this.