What is the primary visible color of an emission nebula?
A) black, because of dust
B) blue from the scattering of light off the tiny molecules
C) blue due to ionized helium atoms
D) red due to ionized hydrogen atoms
E) red because of reddening by dust
Correct Answer:
Verified
Q25: The relative density of dust to gas
Q26: Which statement is true about the interstellar
Q27: Emission nebulae like M42 occur only near
Q28: Most interstellar clouds are:
A)much bigger than our
Q29: The spectra of interstellar gas clouds show
Q31: Some regions along the plane of the
Q32: Which is the least dense?
A)interstellar gas
B)interstellar dust
C)the
Q33: The _ of light passing through thin
Q34: The density of interstellar dust is very
Q35: Which of the following describes the shape
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