Class 8 Science Chapter 17 Stars and the Solar System
Our solar system is consist of sun and celestial bodies. Celestial bodies includes planets, comets, asteroids and meteors. All of these revolves around the sun with the help of gravitational force. However, in this article ‘Our Solar System’ we will talk about Structure of Solar System.
Structure of Solar System
In our solar system sun is the ultimate source of energy. Also, it is nearest star for all the planets. Sun is continuously emitting large amount of heat and light.
Planets are the bodies which do not have their own light. As a result, they receive light from the sun and reflect that light. Moreover, with the help of this phenomena one can distinguish between planets and stars, that is planets do not twinkle, whereas, stars twinkle. Also, stars in the sky remains at same position whereas, planets change their positions.
In our solar system, there are eight planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Among these, Mercury is the closest planet whereas, Neptune is farthest planet to the sun. Also, the planets like Mercury, Venus, Earth and Mars are much nearer to the sun. hence, they are called inner planets. These planets have few satellites. Planets like Jupiter, Saturn, Uranus and Neptune are at farther distance from inner planets hence, these are called outer planets. Moreover, these planets have one or more rings around them with large number of satellites.
The fixed path in which planets revolve around the sun is called as an orbit. Each planet have different orbit. This prevents collision of planets. Also, each planets have different distance from sun. Therefore, farther the planet larger is the orbit of revolution.
As we have talked earlier that planets revolve around the sun, therefore, time required to complete one revolution in an orbit is called period of revolution. Also, period of revolution is large for larger orbits. Interestingly, Planets revolve around sun as well as around themselves. Time required by planet to complete one rotation around itself is called period of rotation.
Some planets have satellite revolving around them. Satellite can be natural as well as manmade. Moon is natural satellite of earth whereas, Aryabhatta is first Indian artificial satellite.
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Keywords: Sun, Planets, Asteroids, Meteor, Meteorites, Structure of solar system, Planets, Satellites, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune