Mathematical evidence for a planet, dubbed Planet Nine or Planet X by space scientists, was revealed by Caltech researchers in 2015.
The strange object, they said, could have a mass some 10 times that of Earth and take up to 20,000 Earth years to complete one orbit of the Sun as it sits between 45 billion and 150 billion kilometers from our star.
The hypothetical Planet Nine, assumed to be lurking somewhere in the outskirts of our solar system, may not be a planet at all.
A new study, published September 24 on the arXiv pre-print server, suggests that the mysterious and still undiscovered object may actually be a big black hole lurking deep within our solar system
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https://phys.org/news/2019-09-planet-primodial-black-hole.html