Question

why earth called as unique planet

Answer 1

There are multiple reasons for earth to be a special planet. Reasons are as follows

Earth is the only planet known where intelligent life exist.
It lies in the circumstellar habitable zone (CHZ). CHZ is defined in the image given below.

3. Earth has a unique magnetic field which protects the earth from the harmful solar winds. These solar winds played a role in transforming venus into hell.


4. Earth has Van Allen radiation belts which protects it from cosmic rays.

5. Our large neighbour Jupiter protects is from many comets and asteroids that come from the keiper belt and Oort cloud.

6. Earth's atmosphere is favorable to support life on earth. This atmosphere consists of different gases in adequate amount. If the percentage of gases would differ then life on earth may face serious consequences.

7. Tectonic plates of earth differentiates it from most other planets.

8. Earth has a solid crust unlike the gaseous planets.

9. Earth has been gifted with a medium sized star which release solar winds and protect us from the harmful radiation of outer space.

Answer 2

*Earth is the only planet that supports life, as far as we know.*

Earth is the only planet we know of with significant bodies of liquid water on the surface.*

Earth is the only planet with substantial amounts of oxygen in its atmosphere.