3.3 Additional Questions :
Answer the following questions :
1. What are celestial bodies.
Ans: The sun, the moon and all those objects shining in the night sky are called celestial bodies.
2. What are stars?
Ans: Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars.
3. We do not feel the heat of the stars, why?
Ans: We do not feel their heat or light, which they look so tiny because they are very, very far from us.
4. What are constellations?
Ans: While watching the night sky, we notice various patterns formed by different group of stars. These are called constellations. Ursa Major or Big Bear is one such constellation.
5. Write 2 sentences on the moon.
Ans: The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it.
6. Who was the first man to step on the moon. And in which year?
Ans: Neil Armstrong was the first man to step on the surface of the moon on 29 July 1969.
7. Only one side of the moon is visible to us. Why?
Ans: The moon moves around the earth in about 27 days. It takes exactly the same time to complete one spin. As a result, only one side of the moon is visible to us on the earth.
8. The earth’s shape is described as a geoid. Why?
Ans: The earth is the third nearest planet to the sun. In size, it is the fifth largest planet. It is slightly flattened at the poles. That is why, its shape is described as a geoid.
9. Draw the solar system.