Beyond the planets

Beyond the ice giant Neptune, the solar system extends to the Kuiper Belt and Oort Cloud. The Kuiper Belt, whose existence was only confirmed in 1992, is 30 to 55 AU wide, according to NASA.. The belt's most famous inhabitant is the dwarf planet Pluto, but it also contains trillions of frozen objects, many of which are remnants of our early solar system. The Oort Cloud is in the solar system's icy outer reaches, and although it has been hypothesized since the 1950s, it has never been observed.