> they smell suspiciously similar to hacks (the bad kind) if a hack could be defined as over-fitting a solution to a problem.
Dark matter is not over-fitting - as described in article, it does not explain galaxy radial velocity as well as MOND. In addition to that, dark matter explains much more and successfully predicted few things. While MOND only described galaxy radial velocity better, but completely failed all the other things. So MOND seems to be the overfitting one.
Physics have theories that are best so far, nobody claims they are 100% proven.
Dark matter is not over-fitting - as described in article, it does not explain galaxy radial velocity as well as MOND. In addition to that, dark matter explains much more and successfully predicted few things. While MOND only described galaxy radial velocity better, but completely failed all the other things. So MOND seems to be the overfitting one.
Physics have theories that are best so far, nobody claims they are 100% proven.