"Researchers now believe that there is around a 7% chance that a rogue planet from a distant part of the galaxy..." by T.K. Randall via Unexplained-Mysteries Astronomers believe that there is a small chance that a rogue planet could have been 'captured' by the Sun's gravity. A few years ago, the possibility that there was an undiscovered planet in our solar system - the so-called 'Planet X' or 'Planet Nine' - prompted a great deal or intrigue, debate and speculation. Some astronomers spent years attempting to find direct evidence of this mysterious world, but to date nothing conclusive has ever been found and the idea is now considered to be mostly discredited. But that doesn't mean that there's no undiscovered planet out there, however. Researchers now believe that there is around a 7% chance that a rogue planet from a distant part of the galaxy (one that was traveling through interstellar space untethered to any star) could have been captured by the Sun's gravity and could now be