Theory:

Dwarf Planets
Small celestial bodies found beyond the planet Neptune.
  • Unlike planets, they can share their orbit with other dwarf planets.
  • Five dwarf planets of the solar system are Pluto, Ceres, Eris, Makemake and Haumea.
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The Moon - Earth’s Satellite
  • Celestial objects that revolve around the planets
  • The moon is the Earth’s only satellite.
  • Duration of revolution: 27  days and  8 hours
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Important!
Duration of rotation and Duration of revolution are the same.
  • No atmosphere
  • The surface of the moon is characterized by craters.
  • The distance between the moon and the Earth: 3,84,400  km.
  • Size of the moon: one-quarter of the Earth.
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Asteroids
  • Small solid objects that move around the Sun.
  • Found between Mars and Jupiter.
  • They are too small to be called planets.
  • They are also known as Planetoids or Minor Planets.
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Hitting of Asteroids is considered as one of the reason for extinction of dinosaurs.
Comets
  • Celestial object made up of a head and a tail.
  • The head of a comet consists of solid particles held together by ice, and the tail is made of gases.
  • Halley’s Comet is the most famous comet which comes close to the Earth every (76) years.
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  • It last appeared in (1986).
  • Expected to appear in (2061).
Meteors and Meteorites
  • Stone-like or metallic body.
  • Most of them burn while entering Earth’s atmosphere.
  • Also known as Shooting Stars
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  • Meteors which strike the Earth’s surface are called meteorites.
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