Scientists Say They May Have Spotted a Huge Hidden Planet Deep in Our Solar System

For over a century, astronomers have wondered if there's an extra planet in our Solar System that we haven't been able to detect yet. It seems like we get another "Planet Nine" candidate — formerly known as Planet X, before Pluto was demoted — every few years, and none have been confirmed. But the possibility has never quite been put to bed, either. Now, an international team of researchers have made a new detection that they say could be a sign of a hidden world — by, poetically, unearthing what went overlooked in very old data. Their findings, reported in a study accepted for publication in the Publications of the Astronomical Society of Australia, suggest that the elusive planet could be up to five to ten times the mass of Earth, and is so far out in the Solar System that it takes 10,000 years to orbit the Sun. "It is pretty amazing to think that something as big as Neptune could be sitting out there and no one would have ever noticed it," Gary Bernstein, an astronomer at the Uni ... Read full article.