One of the biggest mysteries in cosmology is the rate at which the universe is expanding. This can be predicted using the standard model of cosmology, also known as Lambda-cold dark matter (ΛCDM). This model is based on detailed observations of the light left over from the Big Bang—the so-called cosmic microwave background (CMB).

Since I’ve started studying cosmology as a non-professional, I’ve found myself rather convinced that there’s so much dark matter but with a little “d” - since JWST has started giving us incredible data we’ve been finding more and more dense regions of dust, ice and gas where we’ve never thought, or previously seen before - but not new Dark Matter particles, regardless of claims of their influences. To be clear, both models should be studied and MOND continues to develop, however slowly it might be.

As for those who’ve been keeping score between MOND vs DM (with a big “D”) many have pointed to the recent wide binary as “proof” that MOND is falsified. I honestly believe space is so much more nuanced than we’ve observed so far and future discoveries will certainly reveal as much. At any rate, I’d like to link Stacy McGaugh’s recent entry into the debate for consideration.

Edit: Found this Youtube video that does a good job explaining the basics of this paper.

Here’s a direct link to their paper (also found in the phys.org).

And a link to a post I’ve already made about Prof Kroupa - a large proponent for MOND. There’s a link for another post I made for Prof Stacy McGaugh there too; another great source for those interested.