How do we know that the universe is expanding?

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How do we know that the universe is expanding?

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Answer 1 · 2016-03-06T10:31:02

By studying the Doppler shift of Galaxies w can find the expansion of universe.

Explanation:

In 1920 Edwin Hubble studies the spectrum of different galaxies and found the red shift in them..This shows that galaxies are getting away from each other,

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How do we know that the universe is expanding?

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