A galaxy's recession velocity is inversely correlated with its distance from the sun. velocity and distance.
Galaxies are categorised into three basic types under Hubble's scheme, which would be based on the optical aspect of galaxy pictures on photographic plates: ellipticals, spirals, & irregulars.These three classes were separated by Hubble into more specific categories.
Astronomers must be capable of measuring 2 factors in order to determine the Hubble factor by looking at the cosmos:the separation between celestial bodies.Each object's "recession velocity"
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