A. The temperature of objects away from the center of the Universe is about 3 K.

Question

A. The temperature of objects away from the center of the Universe is about 3 K.

B. The Big Bang occurred at a point that is moving rapidly away from us.

C.The expansion of the Universe stretched the wavelengths of the Big Bang radiation.

D.The Big Bang started at 3 K temperature.

The cosmic microwave background radiation corresponds to a blackbody temperature of about 3 K. This implies that:   

A. The temperature of objects away from the center of the Universe is about 3 K.

  

B. The Big Bang occurred at a point that is moving rapidly away from us.

  

C.The expansion of the Universe stretched the wavelengths of the Big Bang radiation.

  

D.The Big Bang started at 3 K temperature.

Explanation / Answer

C.The expansion of the Universe stretched the wavelengths of the Big Bang radiation.

C.The expansion of the Universe stretched the wavelengths of the Big Bang radiation.

The photons that existed at the time of photon decoupling have been propagating ever since, though growing fainter and less energetic, since the expansion of space causes their wavelength to increase over time

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