Quoting what Sagan said about new ideas is a pitiful excuse for not providing answers to questions about what the ideas entail. LambdaCDM gives us both rotatio

Quoting what Sagan said about new ideas is a pitiful excuse for not providing answers to questions about what the ideas entail. LambdaCDM gives us both rotation curves and structure formation (in particular the angular power spectrum to something like 23 peaks), so any new theory needs to reach this baseline.