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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.
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
Important!
Duration of rotation and revolution is 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.
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.

Hitting of Asteroids is considered as one of the reason for extinction of dinosaurs.
Comets
• Halley’s Comet is the most famous comet which comes close to the Earth in every ($$76$$) years.
• It last appeared in $$1986$$
• Expected to appear in $$2061$$