1What different types of celestial bodies exist in space?
2How are all these heavenly bodies held in space?
3How did the universe with all these celestial bodies originate?
4Are all the celestial bodies in the universe in motion?
5When a ball is thrown vertically up from either of the poles of the Earth, why does it always fall back towards the surface of the Earth?
6The Earth revolves around the Sun and the Moon revolves around the Earth. What is the reason for this?
7The Sun, the Earth and the Moon all have their own gravity. How is it possible for them to stay in their places?
8Why do planets and satellites not collide with each other while moving in their orbits?
9Distinguish between a meteor and a meteorite.
10What is a galaxy? In which galaxy is our Solar System located?
11Define gravitational force. Why does the Earth have gravity?
12What would happen if there were no gravitational force between the Sun and the planets?
13If the Earth also pulls the Sun, why does the Sun not move towards the Earth?