Respuesta :
In 1929 the American astronomer Edwin Hubble discovered that the distances to far-away galaxies were proportional to their redshifts. Redshift occurs when a light source moves away from its observer: the light's apparent wavelength is stretched via the Doppler effect towards the red part of the spectrum. Hubble’s observation implied that distant galaxies were moving away from us, as the furthest galaxies had the fastest apparent velocities. If galaxies are moving away from us, reasoned Hubble, then at some time in the past, they must have been clustered close together.
The big bang theory is a prevailing model that describes the expansion and existence of the universe from the earliest periods.
How does Big Bang explain the Hydrogen and Helium ratio in the universe?
- Edwin Hubble was the greatest scientist who discovered the distance of the far-away galaxies is directly proportional to the redshifts. The redshifts refer to the stretching of light's wavelength through Doppler Effect towards the red part of the spectrum.
- The distant galaxies are moving far away and have the fastest velocities. The theory explains that if the galaxies are moving away then they could have been once in the history of the universe were clustered together.
- The rate at which the nucleosynthesis took place determined the ratio of Hydrogen and Helium.
Thus, the correct answer is Option B.
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