The search for Planet Nine, a theorized large planet beyond Neptune, has captivated astronomers for years. Based on unusual orbital patterns of Extreme Trans-Neptunian Objects in the Kuiper Belt, researchers Konstantin Batygin and Mike Brown proposed that these objects' clustered and tilted orbits suggest the gravitational influence of an unseen planet. Estimated to be between 5 and 10 times the mass of Earth, Planet Nine could have a highly elongated orbit, ranging from 300 to 800 astronomical units from the Sun. However, its extreme distance makes it difficult to detect, as it reflects little sunlight and moves slowly across the sky. Recent discoveries, such as the stable orbits of sednoids, challenge the theory's proximity, leading some scientists to suggest that Planet Nine might be farther than previously thought. Future observations from the Vera C. Rubin Observatory may provide critical insights, helping to determine whether Planet Nine is a real celestial body or a theoretical construct arising from observed orbital anomalies. This ongoing quest underscores the vast unknowns of our Solar System and the potential for new discoveries.