fyi, "dark matter" is not a real thing. Modified gravity (MOND) accurately models galactic rotation for hundreds of galaxies with sqrt(GM/R^2 * c*H / 2pi), without the stupid and ludicrous idea of invisible, noninteracting blobs of dark matter around every galaxy.
The reason "dark matter" has persisted in the public consciousness is that TV cosmologists keep pumping it, and academics currently in charge built their careers on it and don't want to lose their funding.
The reason "dark matter" has persisted in the public consciousness is that TV cosmologists keep pumping it, and academics currently in charge built their careers on it and don't want to lose their funding.