Author Question: The hot gas of the big bang seems to be cool at about 2.7 K because: A) the expansion of the ... (Read 23 times)

B · **on:** Jul 27, 2018

The hot gas of the big bang seems to be cool at about 2.7 K because:

A) the expansion of the Universe has decreased the wavelengths of the radiation emitted by the big bang.
B) the gas clouds that emitted the photons during the big bang had a temperature of 2.7 K.
C) the expansion of the Universe has redshifted the wavelengths of the radiation emitted by the big bang about 1100 times longer.
D) the gas clouds that emitted the photons during the big bang emitted blackbody radiation with a wavelength of 2.7 nm.

Question 2

Modern evidence based on what can be determined about the products of nuclear reactions in the first few minutes after the big bang shows that dark matter:

A) does not have any density.
B) does not exist.
C) is not present in galaxies.
D) is not baryonic.