3. What are the three conditions a body must satisfy to be called a planet? 4. W

ID: 298358 • Letter: 3

Question

3. What are the three conditions a body must satisfy to be called a planet?

4. Why was Pluto demoted from the planetary status?

5. What methods are used to discover planets around other stars?

6. When did the first single cell life form on Earth?

7. How did the free oxygen first appear in our atmosphere?

9. How do we measure the age of the Earth (i.e. the age of the oldest rocks)?

10. How does it compare with the age of the Universe?

11. Why the chemical composition of solar system implies it was formed from the remnants of older stars?

3) answer :

for a celestial object to be called as a planet, it must obey the following three laws

1) it has to be in the orbit around the sun

2) it has sufficient mass to assume hydrostatic equillibrium

3) it has to clear the neighbourhood around its orbit

since pluto has failed to follow the third law it is called as dwarf planet

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