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Stars and The Solar System Class 8 NCERT - Planets in Solar System. For more videos and courses, visit https://www.LearnFatafat.com Topics covered: Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune 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 The Sun 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 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. Satellites 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. Class 8 Science syllabus: Chapter 1 - Crop Production and Management Chapter 2 - Microorganisms: Friend and Foe Chapter 3 - Synthetic Fibres and Plastics Chapter 4 - Metals and Nonmetals Chapter 5 - Coal and Petroleum Chapter 6 - Combustion and Flame Chapter 7 - Conservation of Plants and Animals Chapter 8 - Cell Structure and Functions Chapter 9 - Reproduction in Animals Chapter 10 - Reaching the Age of Adolescence Chapter 11 - Force And Pressure Chapter 12 - Friction Chapter 13 - Sound Chapter 14 Chemical Effects of Electric Current Chapter 15 Some Natural Phenomena Chapter 16 - Light Chapter 17 - Stars and the Solar System Chapter 18 - Pollution of Air and Water