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How quickly is the Universe expanding?

In the 1920s, Edwin Powell Hubble was analysing the distances between Earth and various galaxies using the Mount Wilson Observatory in California. In the process, he measured the electromagnetic radiation of the galaxies and discovered mostly what are known as 'redshifts' in their spectra; that is. in the distributions of the various wavelengths. In 1929, Hubble published the outcome of his investigation – almost all galaxies are moving away from us and their speed increases in a linear relationship with their distance from us.

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