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>It is extremely challenging, perhaps impossible, to find a MOND theory that fits all available observations. All the commentators agree on this. What Ranier
by tynpeddler 8y ago
>It is extremely challenging, perhaps impossible, to find a MOND theory that fits all available observations.
All the commentators agree on this. What Ranier and Stacy are pointing out is that the same thing is true of LCDM. Dark matter does not do a good job of explaining galaxy rotation curves (even though this is the context which dark matter was originally proposed for), bullet cluster, abell 520, or lots of other galactic dynamics.
Of course, MOND has its own share of problems. Most importantly that Sean points out is the 3rd peak on the CMB. Stacy sounds like he's holding out for the possibility that relativistic formulations of MOND may explain this peak, though he admits that may not happen. To support his position, Stacy makes reference to other instances where MOND had unintuitive but correct conclusions (like for the bullet cluster).