A team led by Sihao Cheng of the Institute for Advanced Study (IAS) in Princeton, NJ, has discovered an extraordinary Trans-Neptunian Object (TNO) named 2017 OF201 at the edge of our Solar System. Trans-Neptunian Objects are minor planets that orbit the Sun at a greater average distance than the orbit of Neptune. The TNO is potentially large enough to qualify as a dwarf planet, the same category as the much more well-known Pluto. The new object is one of the most distant visible objects in our Solar System and, significantly, suggests that the empty section of space thought to exist beyond Neptune in the Kuiper Belt is not, in fact, empty at all. The new TNO is special for two reasons: its extreme orbit and its large size. The object’s aphelion -- the farthest point in its orbit around the Sun -- is more than 1600 times that of the Earth’s orbit. Its perihelion -- the closest point in its orbit around the Sun -- is 44.5 times that of the Earth’s orbit, similar to Pluto's orbit. The presence of this single object, which at present is at its closest point in its orbit, suggests that there could be another hundred or so similar objects out there with similar elongated orbits. But they are just too far away to be detected right now.