Why Pluto is not a planet anymore

School in 2006, you will remember something.  Like the same sentence.  Which was used to teach children the order of the planets in the solar system - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.

But in these days elementary school, there is no name of pluto in this list of name.What happened to Pluto that drove it out of the solar system as a planet?

 It is not at all the case that this poor planet has moved away from our galaxy or has become the home of another galaxy. It is still present in the corner of our solar system as it used to be as cold and distant as before.

 So what kind of change has taken place that has stripped Pluto of its status as a planet?

 We know more about space than we did a hundred years ago.

 Pluto itself was discovered in the 1930s, so it has not changed as much as a planet before, yet it has not changed the fact that there is something strangely natural about the destruction of a planet.  Is.  Who knew it was something that could happen?

 Once we understand what the word planet means, things can get a little clearer.  The exact definition has changed over time, but from the time of Galileo in the nineteenth century, it worked perfectly, like anything orbiting the sun, until 1801.

 That was the year astronomers discovered Ceres, a planet, and it orbited halfway between Mars and Jupiter.  Astronomers have found that Ceres is very small, about half the radius of the Earth's moon.

 A year after the discovery of Ceres, the astronomical community was disturbed by the discovery of another planet, Pallas. A few years later, they discovered another planet - one after another, and even four new planets.  It is one thing to discover and when they number in the thousands?

 Now it's time to reevaluate some definition

 For this purpose, the astronomer decided to repeat the definition of the planet. Therefore, the astronomer identified three things to identify the planet, which are as follows:

 1: It should be the orbit of the sun - that is, revolve around the sun.

 2: This object should have a circle or at least be closer to it - (Pluto fulfilled two conditions but could not fulfill the third condition) -

 3: The condition is that the planet must affect any kind of astronomical constellation. This means that if a star or any other (object) enters its orbit, it can attract it by its own gravity.