The big bang theory was supported by the discovery of the
a- galaxies in the universe
b- temperature of the universe
c-gravitational forever between planets
d- red shift in electromagnetic spectrum

Option D, red shift in electromagnetic spectrum

Explanation:

According to the Big Bang theory the universe is continuously expanding and all celestial bodies are moving away from each other. This fact was established when red shift affect was discovered. A red shift is basically a shift/increase in the wavelength of light released by any star over a period of time. The farther the star, the more is its wavelength red shifted.

This red shift is continuously increasing which means that the light emitting celestial objects are continuously moving away from each other.

Hence, option D is correct answer

d) center of the mid-ocean ridge

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