The Light from the Expanding Shell of Gas in a Planetary

question 155

Multiple Choice

The light from the expanding shell of gas in a planetary nebula consists of:

• A) bright emission lines of hydrogen, carbon, nitrogen, and other elements.
• B) thermal (blackbody) radiation with peak emission in the infrared.
• C) the light of the central white dwarf star reflected and scattered by dust and gas in the shell.
• D) thermal (blackbody) radiation with peak emission in the ultraviolet.

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