The Mystery of the Ninth Planet in Our Solar System.
The existence of a ninth planet in our solar system, provisionally known as Planet 9, has been theorized due to the peculiar characteristics of Extreme trans-Neptunian objects. If it exists, it would be a new type of planet, larger than Earth and located far beyond Neptune. Recent research has suggested that a meteorite that fell into the Pacific in 2014, CNEOS14, may have been deflected by an unknown massive object in the outer solar system, possibly Planet 9. This has led to a new line of work to locate the planet, which would be a significant discovery in the study of a category of planets that is almost unknown today.