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And there's also a possibility that there's maybe multiple world planets, either worlds that have been ejected from their star system and that were captured by the Sun's gravity. And that could be even farther out from our Sun. In 2023, calculations from... showed that there could be room for up to five Earth-like rocky planets to hide in the very outer bounds of the solar system. So some astronomers have also proposed alternative explanations for planet X, including the gravitational disturbances caused by, as I mentioned earlier, a leading black hole, or even a result of some really strange or alternative form of gravity that science doesn't have an understanding of, even as of yet.