question_answer

          Why is Pluto not considered as a planet?

Answer:

                        

The sun is the head of the solar family with nine planets revolving around it. But now, Pluto is no longer considered as a planet because of the following reasons :

(i) A planet is a celestial body that revolves around the sun.

(ii) A planet must not be a satellite.

(iii) It must be big enough to dominate its orbits.

Pluto does not adhere to the last part of the definition so, it is called a ?dwarf planet?.