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How was the expansion of the universe discovered?

Answer 1

In 1929 Edwin Hubble using 100 inch telescope found out that the galaxies are receding from us.

The studies, which only proved that the universe is expanding, revealed that distant galaxies are receding faster. All of these findings were made by examining the red shift of galaxies.

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Answer 2

Asher Cohen

The redshift of galaxies is a useful tool for observing the expansion of the universe. Edwin Hubble observed in 1929 that galaxies were moving away from us, and that their velocity increased with distance. This led to the conclusion that the universe was expanding.

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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.