Why do people think there is a giant “hidden” planet somewhere in the depths of our solar system?
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Several years ago [astronomers at Caltech found evidence](https://astrobiology.nasa.gov/news/caltech-researchers-find-evidence-of-a-real-ninth-planet/) of a large, unobserved planet by using computer modeling to extrapolate from the movements of objects in the Kuiper Belt at the edge of the solar system. Apparently it was pretty convincing, but if the planet exists, it will have an orbital period of over 10,000 years and be all but impossible to find. Astronomers have presumably been searching the sky ever since, hoping to be the first to spot “Planet Nine”.
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