Expanding universe | Description & Facts | Britannica
britannica.com
Expanding universe | Description & Facts | Britannica
Expanding universe, dynamic state of the extragalactic realm, the discovery of which transformed 20th-century cosmology. The development of general relativity and its application to cosmology, along with the detection of extragalactic redshift, led to the realization in the 1920s that all galaxies are receding.
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