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How many Earth like planets are there in the universe with existence of air water and life?

Answer 1

Present technology does not allow us to detect water, air in exoplanets. THey are far away and we find them by indirect methods not direct viewing.

Only a few planets can be said to be in the Goldilocks zone, where the temperature is just right for liquid water.

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Answer 2

Lydia Allen

Though exact numbers are hard to come by, estimates put the number of Earth-like planets in the universe that could support life as we know it at billions.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.