Today I learned a very interesting stuff about planet, so thought to share with all of you.
What is the criteria to figure it out whether a celestial body is a planet or not? There are three criteria to determine this.
1) It should orbit around the sun.
2) It should be big enough that it's own gravity pulls it into the shape of ball.
3) It must have cleared other things out of the way in its orbital.
Pluto was used to be define as a planet. But Pluto orbits among the icy wrecks. So this does not meet third criteria. And that is the reason, we don't include Pluto in our solar system planet list.
Hope you would like this interesting fact.
Arushi
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