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redshiftIFLScience
•73% Informative
The idea that the universe is expanding was first proposed by Edwin Hubble in the late 1920s .
The theory states that more distant galaxies appear redder than those closer to Earth a phenomenon known as redshift.
This happens because the wavelength of light increases as objects move away from each other, thus shifting it towards the red end of the spectrum.
Because all galaxies are redshifted, it follows that they are all moving away from us.
The Tired Light theory has been used to support a static universe rather than an expanding one.
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