Why Pluto is Called a Dwarf Planet
Pluto was once considered the ninth planet from the Sun. However, in 2006, the International Astronomical Union (IAU) reclassified Pluto as a dwarf planet. This decision was controversial, and many people still believe that Pluto should be considered a planet. In this article, we will explore the reasons why Pluto was reclassified as a dwarf planet and why some people still believe that it should be considered a planet.
The IAU’s Definition of a Planet
According to the IAU, a planet is a celestial body that:
- Orbits the Sun.
- Has enough mass to be spherical.
- Has cleared its orbit of other objects.
Pluto meets the first two criteria. However, it does not meet the third criterion. Pluto’s orbit is intersected by the orbits of several other objects, including the dwarf planet Eris. This means that Pluto has not cleared its orbit of other objects and therefore does not meet the IAU’s definition of a planet.
The Controversy Over Pluto’s Reclassification
The decision to reclassify Pluto as a dwarf planet was controversial. Many people believe that Pluto still deserves to be considered a planet because it is the largest known object in the Kuiper Belt. The Kuiper Belt is a region of the solar system that is located beyond the orbit of Neptune. It contains millions of icy objects, including comets and asteroids.
Those who support the reclassification of Pluto as a dwarf planet argue that it is important to have a clear definition of what constitutes a planet. They argue that Pluto does not meet the IAU’s definition of a planet and that it should therefore be reclassified as a dwarf planet. They also argue that the reclassification of Pluto does not diminish its importance or its scientific value.
Conclusion
The reclassification of Pluto as a dwarf planet was a controversial decision that is still debated today. However, the IAU’s definition of a planet is clear, and Pluto does not meet the third criterion. Therefore, Pluto is correctly classified as a dwarf planet.
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