It was not so much a discovery that Pluto wasn't a planet, so much as a general concensus that it shouldn't be called a planet anymore. Over the past decade, astronomers have discovered several bodies beyond the orbit of Pluto that are in fact larger (for example, Eris.) They realized that there were probably many more they hadn't discovered yet and that the term planet was impractical for Pluto since it was so small and there were so many similar sized objects orbiting the Solar System. Eris was probably the final blow to Pluto's status. It is larger than Pluto and for a long time astronomers called it the solar system's "tenth planet''. In the face of this discovery and the fact that many other similarly sized objects had been found, the International Astronomical Union decided to formally define the word "planet" for the first time in 2006 and in the process effectively demoted Pluto.
Pluto is not a planet (it's a dwarf planet)
Pluto is a dwarf planet.
Pluto is no longer a planet but is classified as a dwarf planet, So Pluto is classified as a dwarf planet. Neither terrestrial or gas planet.
Pluto the dwarf planet is an example of of a dwarf planet.
Pluto
24.
Pluto, it is now a dwarf planet or planetoid.
Pluto is not a planet its a dwarf planet
Pluto is a rocky world. Pluto is now reclassified as a dwarf planet.
Pluto is a dwarf planet
dwarf planet Pluto
Pluto is a planet!
neptuneNeptune is the closest to Pluto. Uranus is the second closest planet to Pluto. Saturn is the third closest planet to Pluto. Jupiter is the forth closest planet to Pluto. Mars is the fifth closest planet to Pluto. Earth is the sixth closest planet to Pluto. Venus is the seventh closest planet to Pluto. Mercury is the most furthest away from Pluto. The Sun and the moon are not considered as planets. The planet Pluto is also not considered as a planet.
no Pluto is the smallest planet in the worl and Pluto is also the outer planet
Neptune. It would be Pluto, but Pluto is a dwarf planet ( a planet that was a planet, but decided that it wasn't a planet)
Pluto is not a planet (it's a dwarf planet)
There is no such thing as a good planet or a bad planet. Also, Pluto is not a planet.