1. What are planets? Where does the word "planetai"derived from?
Ans.i) Some celestial bodies do not have their own heat and light. They are lit by the stars. Such bodies are called planets.
ii) The word planet comes from the Greek word planetai which means "wanderers".
2. What are asteroids?
Ans. I) Apart from the sun, planets and satellites, there are numerous tiny bodies which also move around the sun.
ii) These bodies are called asteroids.
iii) They are found in the orbits of Mars and Jupiter.
3. What is the significance of sun?
Ans. I) The sun provides the pulling force that binds the solar system.
ii) It is the ultimate source of light and heat for the earth.
Ans.i) Some celestial bodies do not have their own heat and light. They are lit by the stars. Such bodies are called planets.
ii) The word planet comes from the Greek word planetai which means "wanderers".
2. What are asteroids?
Ans. I) Apart from the sun, planets and satellites, there are numerous tiny bodies which also move around the sun.
ii) These bodies are called asteroids.
iii) They are found in the orbits of Mars and Jupiter.
3. What is the significance of sun?
Ans. I) The sun provides the pulling force that binds the solar system.
ii) It is the ultimate source of light and heat for the earth.
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