What Ionizes the Gas in a Planetary Nebula and Makes

question 85

Multiple Choice

What ionizes the gas in a planetary nebula and makes it visible?

• A) X-ray photons emitted by a pulsar
• B) ultraviolet photons emitted by a white dwarf
• C) the shock wave from a supernova
• D) hydrogen burning in the nebular gas
• E) infrared photons from a nova explosion

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Definitions:

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