Explain why Pluto not in our solar system ?

Question

Answer

Because it is so small in size compared to other planets!

Answer

In 2006 the International Astronomical Union ( IAU ) adopted a new definition for a planet. As Pluto does not fit this definition, it is no longer a planet of the solar system.

Answer

Pluto IS in our solar system, but it is not considered a planet, please check your question...

Answer

Pluto's Classification as a Dwarf Planet

Pluto, previously considered the ninth planet in our solar system, is no longer classified as such. In 2006, the International Astronomical Union (IAU) redefined the criteria for what constitutes a planet, leading to Pluto's reclassification as a dwarf planet. This decision was based on several factors, which are outlined below.

Size and Mass
- One of the key criteria for a celestial body to be classified as a planet is its size. Pluto is significantly smaller than the other eight planets in our solar system.
- Its diameter is about 2,370 kilometers, which is approximately two-thirds the size of Earth's moon. This makes Pluto smaller than several moons in our solar system, such as Ganymede and Titan.
- Additionally, Pluto's mass is much smaller compared to the planets. It has only 0.2% of the mass of Earth. This low mass and small size led to the reconsideration of Pluto's planetary status.

Orbit and Clearing the Neighborhood
- Another criterion for being classified as a planet is that it must have cleared its orbit of other debris. In other words, a planet should be the dominant gravitational force in its orbital neighborhood.
- Pluto's orbit intersects with that of Neptune, and it is influenced by Neptune's gravity. This means that Pluto has not cleared its orbit and shares its space with other objects in the Kuiper Belt, a region beyond Neptune populated by icy bodies.
- In contrast, the eight planets in our solar system have cleared their orbits and are the dominant gravitational forces in their respective regions.

Composition and Location
- Pluto's composition also plays a role in its reclassification. It is primarily composed of rock and ice, similar to other objects in the Kuiper Belt.
- The IAU's definition of a planet includes the requirement that a celestial body orbits the Sun and is not a satellite of another planet. Since Pluto shares its orbit with other objects and is not the dominant gravitational force in its region, it does not meet this criterion.

Conclusion
In conclusion, Pluto is no longer considered a planet in our solar system due to its small size, low mass, inability to clear its orbit, and composition similar to other objects in the Kuiper Belt. The IAU's redefinition of a planet led to the classification of Pluto as a dwarf planet, distinguishing it from the eight traditional planets in our solar system.

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