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In the Big Bang theory, what is the observational sign of cosmic expansion?

Answer and explanation

Correct answer: Red shift of distant galaxies

The governing concept is the Doppler and cosmological red shift of light. When a distant galaxy is receding, the wavelengths of the light it emits are stretched toward the red end of the spectrum. Astronomers observe that the light from most distant galaxies is red-shifted, and, broadly, more distant galaxies show greater recession speeds. This pattern is evidence that space itself is expanding and supports the Big Bang model. Therefore option A is correct. River erosion, soil-colour change and sea-wave height are Earth-surface or oceanographic observations; they do not measure the large-scale expansion of the universe.

Related tags

Big BangRedshiftCosmic ExpansionEarly And Modern TheoriesThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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