The mystery of galaxy rotations has led to the proposal of dark matter and modified gravity theories like MOND. However, recent research challenges MOND’s validity. The Cassini mission’s data, combined with studies on wide binary stars and the outer Solar System, refute MOND’s predictions. Additionally, MOND fails to explain motions within galaxy clusters. While dark matter isn’t without its own challenges, it remains the favored explanation, suggesting a need for further exploration into its nature. Ultimately, MOND falls short, affirming dark matter’s dominance in astrophysics.