Why is Pluto not considered a planet anymore, here's what science says

In our solar system, Mars is followed by the asteroid belt, followed by the orbit of Jupiter, Uranus and then Neptune. Ahead of Neptune's orbit comes another belt full of icy asteroids orbiting the Sun. This belt is known as the Kuiper belt, one of these bodies is Pluto.

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Pluto was discovered in the year 1930. For 76 years after its discovery, that is, till 2006, it was considered a planet. The interesting thing is that for 62 years after its discovery, no other body of the Kuiper belt could be discovered. In such a situation, Pluto is unquestionably considered to be the ninth planet of the solar system, without objections raised.

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But as telescopes got bigger, our astronomers began to see a clearer picture of objects in distant space, including Pluto. Gradually, astronomers also came to know that Pluto is much smaller than other planets, better instruments kept on reducing its size further. The second Kuiper belt body was discovered in 1992. By then it was known that Pluto is actually smaller than our moon.

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Another thing that stood out about Pluto is that its orbit intersects the orbit of Neptune. Such is not with any other planet in the solar system. In the last decade of the last century and onwards, more bodies of the Kuiper belt were discovered, the number of which quickly reached hundreds.

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But there was a problem when in the year 2005, a body named Eris was discovered in the Kuiper belt, which was bigger than Pluto.

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Now a question has arisen in front of the scientists. Should both Pluto and Eris be declared planets? In such a situation, why would all those bodies which are a little less than Pluto in size, should also be called planets? In such a situation, how many names will have to be remembered of planets. That is why in 2006 the astronomers of the International Astronomical Union had to hold a meeting for this.

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In this meeting, it was decided to take the decision through voting. Many people voted in favour of keeping Pluto as a planet with an emotional attachment to it, but most astronomers were not in favour of keeping Pluto in the category of a planet as they thought that it was a mistake to call Pluto a planet and that it should have been called a body of the Kuiper Belt from the beginning.

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After this, Pluto was no more considered a planet but was placed in the category of dwarf planets. Dwarf planets are those bodies whose shape is spherical due to their gravity. Many such dwarf planets have been discovered in the Kuiper belt and are likely to be found in large numbers. Not only this, a dwarf planet named Ceres is present only in the asteroid belt.

Of course, planet Pluto, which has been called a planet for 76 years, is still considered so in many books. It is still like a planet for many astronomers and they are studying it like a planet too. At the same time, many astronomers are trying to bring Pluto back to the category of a planet.

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In 2015, NASA's New Horizons spacecraft has sent a lot of information about Pluto, it shows that Pluto is a planet with mountains, glaciers, craters. It is a planet with a thin atmosphere.

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