What profound realization did Edwin Hubble bring to astronomy about the cosmos?

Answer

The universe was dynamic, evolving, and likely had a beginning, moving away from a static model.

Edwin Hubble's most profound realization was overturning the long-held assumption of a static and eternal cosmos. His observations showed that galaxies were systematically moving away from each other, implying that the universe was not unchanging but rather dynamic and evolving. This systematic movement away, where recession rate was proportional to distance, strongly suggested that the universe originated from a singular beginning point in time, fundamentally reshaping cosmology and laying groundwork for the Big Bang theory. The concept of a steady-state model, favored by some at the time, was effectively refuted by this empirical evidence of an evolving universe.

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Hubble galaxy Astronomer movement observation