| Hubble law | is a kind of cosmology theory |  |
| has definition A relation which states that recessional speed is proportional to distance for a homogeneous and isotropic universe. Galaxies moving away from us with a speed precisely following this relation are said to follow the Hubble flow. Because the actual universe is not precisely homogeneous, with lumpiness arising from clustering of galaxies and voids of empty space, the motions of actual galaxies deviate somewhat from the Hubble flow. | |
| cosmology theory | has domain cosmology | |
| theory | has validity correct or incorrect with caveats | |
| has author or reasearch group | |
| has date or a range of dates for which the theory was active | |
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