Our solar system officially houses eight planets, but some scientists say there could be a ninth. And that’s not just Pluto aficionados – evidence suggests a huge undiscovered world lurks on the dark ...

For years, the existence of a missing Planet 9 has been one of the predominate theories attempting to explain some of the eccentric orbits found in the outer Solar System. But so far, no such planet ...

For decades, astronomers have suspected that a massive, unseen planet may be shaping the strange orbits of distant objects beyond Neptune. Recent simulations suggest the odds of these gravitational ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers ...

Astronomers suggest that an alternative concept of gravity, known as modified Newtonian dynamics, could explain orbital inconsistencies that have previously pointed to the existence of a ninth planet ...

Popular Mechanics: Harsh Mathur, professor of physics at the College of Arts and Sciences, explained he and his research partner’s recent study suggesting that, instead of a possible ninth planet in ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers ...