Evidence of Massive Amounts of Hydrogen Gas Surrounding Some Young

question 267

Multiple Choice

Evidence of massive amounts of hydrogen gas surrounding some young, hot 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 characteristic of 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.

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