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?.
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