Before you get carried away by the title, let me clarify – the theory of “dark matter” is not going anywhere anytime soon. However, an old enemy, in the form of the “MoND” theory, is gathering strength. Depending on how further investigations into the matter go, the theory of dark matter may soon have a worthy challenger.

Read more here: https://briankoberlein.com/2016/09/29/galactic-motion-challenges-dark-matter/