Three of the following are reasons why visible emissions from neutral hydrogen in the far regions of the Milky Way Galaxy would be difficult at best to detect on Earth. Which is NOT a correct explanation?
A) Neutral hydrogen does not emit visible light unless it receives an input of energy, which is unlikely in the cold regions of interstellar space.
B) The density of neutral hydrogen is too low to emit enough visible light to be detected.
C) Interstellar extinction would delete visible light before it crossed the galaxy.
D) At these cold temperatures, Wien's law gives an emission intensity that is essentially zero.
Correct Answer:
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