Planet keya hai ?
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**Planet kya hai?**
Planet (ग्रह) ek aisa khagoliya (astronomical) pind hota hai jo kisi tare (star) ke chaaron taraf ghoomta hai, jaise humari Earth Sun ke chaaron taraf ghoomti hai. Ek planet banne ke liye teen zaroori shartein poori honi chahiye: pehla, wo apne star ke around orbit kare; dusra, uska apna gravity itna strong ho ki wo gol (spherical) shape mein aa jaye; aur teesra, uske orbit ke aas-paas ka area doosre bade objects se clear ho, matlab wo apne path ka “boss” ho.
Humare Solar System mein 8 planets hain – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, aur Neptune. Inhe unke composition ke basis par do categories mein baanta jata hai: **terrestrial planets** (rocky, jaise Mercury, Venus, Earth, Mars) aur **gas/ice giants** (jaise Jupiter, Saturn, Uranus, Neptune, jo mostly gas aur liquid
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