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Learn in an easy and fast way! Things you’ve never heard about before! Interesting facts! Pluto has no atmosphere! PLUTO OUR SOLAR SYSTEMS DWARF PLANET It also has a moon half its size! DWARF PLANET Once known as one of the 9 main planets! It is dense and rocky, like the terrestrial planets. However, its nearest neighbors are the gaseous Jovian planets. This is why many scientists believe that Pluto originated elsewhere in space and got caught in the Sun's gravity. There is a theory that Pluto used to be one of Neptune’s moons. Learning is FUN! - Renamed as a dwarf planet in 2006! - Pluto was discovered in 1930 ONCE THE NINTH PLANET OF OUR SOLAR SYSTEM Why is it no longer considered a planet?! Does not meet the criteria of a planet Pluto is relatively round and orbits the Sun, but it does not meet the criteria because its orbit crosses Neptune's orbit Pluto spins in the opposite direction as Earth, which means the sun rises in the west and sets in the east. Only Venus, Uranus, and Pluto have a retrograde rotation. It takes about five hours for sunlight to reach Pluto. It takes eight minutes to reach Earth.