When Astronomers Look for Evidence of Hydrogen Gas in the Spectra

question 180

Multiple Choice

When astronomers look for evidence of hydrogen gas in the spectra of the Sun, the planets, or the nearby stars, the positions of the spectral features or "lines" due to hydrogen are in

• A) a pattern in which the positions of the lines depend on the temperature of the source.
• B) the same pattern for the Sun and for planetary sources but very different for stars at larger distances because of absorption of light by the interstellar matter.
• C) the same characteristic pattern as seen in the laboratory, a pattern unique to hydrogen.
• D) a pattern that depends on the location of the planet or star and that can be reproduced only with difficulty in the laboratory.

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