Planet X: A planet in the outer reaches of the solar system?

Scientists have found some evidence that there might be another planet orbiting deep out in the solar system! They, have nicknamed it "Planet Nine" or "Planet X." This planet has an estimated mass of 1 to 10 times bigger than Earth, and its size places it somewhere between Earth and Neptune. It takes between 10,000 to 20,000 years to orbit the sun. And it is an estimated 60 billion miles from the sun, which is about 645.47 AU. Astronomers studying the Kuiper belt noticed that some of the objects there would clump together, which shows some evidence that there is an object there. This does not mean that this planet is here for certain; these are only theories and this topic is still a very controversial one.