Five years ago scientists proposed the hypothetical existence of a large world tens of millions of miles from the Sun, which has come to be known as 'Planet Nine.'
TNOs are any object in the Solar System beyond the orbit of Neptune, including those that make up the Kuiper Belt, a vast disc of small bodies that orbit the Sun.
However, despite efforts to find it, Planet Nine has never been directly observed. And while some follow up studies have strengthened the case for its existence, some research—like the latest paper—has proposed alternative explanations for the weird orbits. They then suggest the"more exciting possibility" that the weird TNO orbits are the result of a primordial black hole—one formed at the very beginning of the universe—which has been captured by the gravitational influence of the solar system.
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