Edwin Hubble, Doppler Shift, and the Expanding Universe

The video tutorial discusses Edwin Hubble's contributions to astronomy, including the categorization of galaxies and the discovery that the universe is expanding. It explains the history of astronomy, the realization of galaxies beyond the Milky Way, and the Doppler effect's role in understanding redshift. Hubble's observations led to the formulation of Hubble's law, which describes the relationship between a galaxy's distance and its recession velocity, providing evidence for the Big Bang theory.

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