Dark matter: The mysterious entity in the universe

Dark matter differs from other common substances in physics. It is a rather abstract substance because it cannot be seen or touched. In astrophysics, most scientists believe that dark matter exists because many phenomena would likely be unexplainable without invoking dark matter. However, in quantum mechanics and particle physics, most scientists are convinced that dark matter does not exist, as in these fields, scientists rely on empirical evidence and are less inclined towards hypotheses and conjectures. Therefore, the existence of dark matter remains a mystery in the scientific community. The primary method of studying dark matter is to compare measured values with observed values and explore the reasons behind these differences when discrepancies arise. In this regard, this paper investigates the reasons for discrepancies from three perspectives: rotation curves, gravitational curves, and galaxy distribution. In conclusion, although the existence of dark matter is not certain, there is evidence supporting its existence.