1Why are the stars in the universe moving away day by day?
2What does universe science study, and what does astrophysics study?
3Where is our solar system in the Milky Way galaxy?
4Explain the Big Bang theory in brief.
5What is Hubble's law? Write its equation and state what each symbol stands for.
6What does it mean that Hubble's constant is 73 km/s/Mpc?
7A galaxy is 3 Mpc away from us. Find the velocity with which it is moving away.
8How does the balloon activity help to explain the expanding universe?
9How does Hubble's study support the Big Bang theory?
10If the universe is expanding, why is the speed of the celestial bodies decreasing?