Who gave the expanding universe hypothesis?
Edwin Hubble
The correct answer is Edwin Hubble.
Edwin Hubble's observations of distant galaxies in the 1920s provided strong evidence for an expanding universe. He noted a relationship between the distance of a galaxy and its redshift (the stretching of light waves due to the Doppler effect). This relationship, known as Hubble's Law, indicates that galaxies are moving away from us, and the farther away they are, the faster they are receding. This observation strongly supported the expanding universe hypothesis, a cornerstone of modern cosmology.
While other scientists contributed to our understanding of the universe, Hubble's direct observation and quantification of galactic recession velocities were pivotal in establishing the expanding universe theory.
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