Evidence of massive amounts of hydrogen gas surrounding some stars comes from:
A) observation of the reddening of the spectra of these stars because of absorption of blue light by hydrogen.
B) observation of emission of characteristic red Balmer light from nebulosity around them.
C) theoretical calculations that correctly describe stellar formation by the gravitational contraction of hydrogen gas.
D) observation of the blue glow from scattered light in their reflection nebulae.
Correct Answer:
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