WHERE WE GONNA GO? PLANET X. Mysterious Planet ‘The Goblin’ Redefines Solar System.

Planet X, an as-of-yet unseen world could be shaping the orbits of smaller, extremely distant objects like the newly described 2015 TG387, nicknamed “The Goblin.” The Goblin is likely spherical and about as wide as the state of Massachusetts. And much like a handful of other distant solar system inhabitants, its orbital behavior might signal the presence of Planet X lurking in the distant outer dominions of the solar system.

The Goblin is the third minor planet to have been found in the outer solar system, following the discoveries of Sedna and, recently, another object called 2012 VP113. This region, which was once thought of as a cold, dark, and empty realm now appears to be a rich collection of exotic and extreme objects. And these three planets may be just the beginning of the discoveries.

It’s breathtaking how much we still have to discover about our own solar system.