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Dwarf Planets
- 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 8hours
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
- 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 in every (76) years.
- It last appeared in 1986
- Expected to appear in 2061
Meteors and Meteorites
- A meteor is stone-like or metallic body
- Most of them burn while entering Earth’s atmosphere.
- Also known as Shooting Stars
- Meteors which strike the Earth’s surface are called Meteorites.
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