On the topic of outlandish gravity ideas, I came across this video between Brian Greene and Neil deGrasse Tyson talking about how dark matter might not be matter but gravity leaking from another universe: https://youtu.be/1L6hinhDXQE?si=lfgOhk5phh88IMHO
Is that even wrong? We'd have to know something about another universe which we can't by definition. At best it's a backstory for our already outlandish idea of the placeholder particle that fits all our unexplained observations.
