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→Support for the Big Bang theory
The Hubble redshift in atomic spectra of distance cosmic objects, discovered by Edwin Hubble around 1929, is claimed as a source of evidence for the [[Big Bang theory]].<ref>Edwin Hubble (1929). [http://www.pnas.org/cgi/reprint/15/3/168/ "A relation between distance and radial velocity among extra-galactic nebulae"]. Proceedings of the National Academy of Sciences 15: 168–173.</ref> The redshift, the expanded wavelength of light, suggests that these objects are moving away from Earth due to the expansion of the universe. It also suggests either that the universe is undergoing accelerating expansion for an unknown reason<ref>
The Hubble redshift in atomic spectra of distance cosmic objects, discovered by Edwin Hubble around 1929, is claimed as a source of evidence for the [[Big Bang theory]].<ref>Edwin Hubble (1929). [http://www.pnas.org/cgi/reprint/15/3/168/ "A relation between distance and radial velocity among extra-galactic nebulae"]. Proceedings of the National Academy of Sciences 15: 168–173.</ref> The redshift, the expanded wavelength of light, suggests that these objects are moving away from Earth due to the expansion of the universe. It also suggests either that the universe is undergoing accelerating expansion for an unknown reason<ref>
The reason was proposed in 1985 as the time running slower in deep space galaxis than in our Galaxy from which the those deep space galaxies are observed. The effect has been confirmed with accuracy to one standard deviation by Supernova Cosmology Project team of astronomers, which observations produced relation
The reason was proposed in 1985 as the time running slower in deep space galaxis than in our Galaxy from which the those deep space galaxies are observed, due to the coupling between the [[time dilation]] and the [[curvature of space]]. The effect has been confirmed with accuracy to one standard deviation by Supernova Cosmology Project team of astronomers, which observations produced relation
:<math>dH/dt=-H_o^2/2</math>,
:<math>dH/dt=-H_o^2/2</math>,
where <math>dH/dt</math> is apparent acceleration of expansion of space, and <math>H_o</math> is [[Hubble constant]].
where <math>dH/dt</math> is apparent acceleration of expansion of space, and <math>H_o</math> is [[Hubble constant]].