In 1929, American astronomer Edwin Hubble published one of the astounding discoveries of the twentieth century. Through observations of far off galaxies, Hubble found that the universe is expanding and the galaxies are moving away from each other. Their speeds kept increasing, the farther they were from each other. This theory is known as Hubble’s Law.
Hubble’s Law is regarded as the first observational foundation for the expansion of the universe. However, the idea of universe expanding at a calculable rate was not introduced by Hubble. Alexander Friedmann derived this from general relativity equations in 1922 which was published as the ‘Friedmann equations.’ After Hubble’s discovery, Einstein called his own assumptions about a static universe his ‘biggest mistake.’
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