Q10 of 19 Page 186

How many planets like Earth can be there in our galaxy ‘milky way’?

The galaxy that contains our solar system is called the Milky Way. Scientific researches show that there are more than a billion Earth-like worlds are present in our galaxy.


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8

The Physical environment of the Earth and the organisms found on the Earth together act as a living unit. What is this hypothesis called?

 9

At the time of the formation of the planet like Earth, the environment was very hot and explosive. How much time would it have taken to cool down?

 11

What is the meaning of world alien?

 12

How must the first life have originated on the Earth according to Darwin?