Editing Trans-Neptunian object (section)

=== Subsequent discoveries ===
After Pluto's discovery, American astronomer [[Tombaugh, C. W.|Clyde Tombaugh]] continued searching for some years for similar objects but found none. For a long time, no one searched for other TNOs as it was generally believed that Pluto, which up to August 2006 was classified as a planet, was the only major object beyond Neptune. Only after the 1992 discovery of a second TNO, [[15760 Albion]], did systematic searches for further such objects begin. A broad strip of the sky around the [[ecliptic]] was photographed and digitally evaluated for slowly moving objects. Hundreds of TNOs were found, with diameters in the range of 50 to 2,500 kilometers. [[Eris (dwarf planet)|Eris]], the most massive TNO, was discovered in 2005, revisiting a long-running dispute within the scientific community over the classification of large TNOs, and whether objects like Pluto can be considered planets. In 2006, Pluto and Eris were classified as [[dwarf planet]]s by the [[International Astronomical Union]].