High Quality Content by WIKIPEDIA articles! A trans-Neptunian object (TNO) is any object in the Solar System that orbits the Sun at a greater distance on average than Neptune The Kuiper belt, scattered disk, and Oort cloud are three divisions of this volume of space The first trans-Neptunian object to be discovered was Pluto in 1930 It took more than ожжщо 60 years to discover, in 1992, a second trans-Neptunian object, (15760) 1992 QB1, with only the discovery of Pluto's moon Charon before that in 1978 Since then however, over 1,000 trans-Neptunian objects have been discovered, differing in sizes, orbits, and surface composition 198 of these (as of November, 2009) have their orbit well enough determined that they are given a permanent minor planet designation.  В этой книге2010 г Мягкая обложка, 240 стр ISBN 613040011X.