Eli5 How did people figure out how old the universe is?

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I know it’s definitely very complicated but I’m very curious

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One guy, Edwin Hubble, studied the light of stars from faraway galaxies and measured the rate at which they were moving away from us by analyzing the stretching of the wavelengths of light by the Doppler effect (a process called redshift). By determining the expansion rate of the universe, known as the Hubble constant, the age of the universe was calculated

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