Q11 of 19 Page 186

What is the meaning of world alien?

Extra-terrestrial life i.e. the life form which has not originated on Earth. It must have invaded Earth from outer space is generally referred to as an alien.


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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?

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

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

 13

What was the fear of the scientist at the time of launching Pioneer-10?