If a Seyfert Galaxy's Nucleus Varies in Brightness on the Timescale

question 12

Multiple Choice

If a Seyfert galaxy's nucleus varies in brightness on the timescale of 10 hours, then approximately what is the size of the emitting region?

• A) 20 AU
• B) 30 AU
• C) 50 AU
• D) 70 AU
• E) 120 AU

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