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Edwin Hubble
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Edwin Powell Hubble was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology. Hubble proved that many objects previously t
Studio portrait photograph of Edwin Powell Hubble
Studio portrait photograph of Edwin Powell Hubble
Hubble (middle row, second from right) with other members of the University of Chicago track team, 1909
Hubble (middle row, second from right) with other members of the University of Chicago track team, 1909
Hubble's American Expeditionary Forces identity card, 1918
Hubble's American Expeditionary Forces identity card, 1918
The 100-inch (2.5 m) Hooker telescope at Mount Wilson Observatory that Hubble used to measure galaxy distances and a value for the rate of expansion o
The 100-inch (2.5 m) Hooker telescope at Mount Wilson Observatory that Hubble used to measure galaxy distances and a value for the rate of expansion of the universe.
Hubble's law
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Hubble's law, officially the Hubble–Lemaître law, is the observation in physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance. Thus, the farther a galaxy
Edwin Hubble
…distances. Hubble confirmed in 1929 that the recessional velocity of a galaxy increases with its distance from Earth, a behavior that became known as Hubble's law, although it had been proposed two years earlier by Georges Lemaître. The Hubble law implies that the universe is expanding. A decade before, American…
Three steps to the Hubble constant
Three steps to the Hubble constant
Fit of redshift velocities to Hubble's law. Various estimates for the Hubble constant exist.
Fit of redshift velocities to Hubble's law. Various estimates for the Hubble constant exist.
A variety of possible recessional velocity vs. redshift functions including the simple linear relation v = cz; a variety of possible shapes from theor
A variety of possible recessional velocity vs. redshift functions including the simple linear relation v = cz; a variety of possible shapes from theories related to general relativity; and a curve that does not permit speeds faster than light in accordance with special relativity. All curves are linear at low redshifts.
Bridge diagram showing different measurements of the Hubble constant, 2021
Bridge diagram showing different measurements of the Hubble constant, 2021