Question

How do astronomers know how big the universe is?

Answer 1

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Astronomers know how big the universe is by swing many implements. Such as Microscope, which helps them to find out how big the planets, stars, meteors and other celestial bodies are.

It can be conclude that they also uses the radius of the other planets to find out the area covered by it.

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Answer 2

Astronomers know how big the universe is by swing many implements. Such as Microscope, which helps them to find out how big the planets, stars, meteors and other celestial bodies are.

It can be conclude that they also uses the radius of the other planets to find out the area covered by it.