Pluto Loses its Status as a Planet.
The International Astronomical Union (IAU) declassified Pluto as a planet and classified it as a dwarf planet. According to the IAU definition, a dwarf planet is neither a planet or a natural satellite. It is ‘a celestial object orbiting a star that is massive enough to be rounded by its own gravity but has not cleared its orbit of space debris’. Discovered in 1930 by American astronomer Clyde Tombaugh, Pluto is the largest but second-most massive dwarf planet in our solar system. The most massive dwarf planet orbiting our sun is Eris.