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

question 37

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) 70 AU
• C) 90 AU
• D) 140 AU

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Definitions:

Aztecs

A Mesoamerican culture that flourished in central Mexico in the post-classic period from 1300 to 1521, known for their complex society, architecture, and contributions to mathematics and astronomy.

Publicly Executing

The act of carrying out a death sentence in front of a public audience, historically used as a method of punishment and deterrence.

Santa Fe

The capital of the state of New Mexico, known for its Pueblo-style architecture and as a creative arts hotbed.

Spanish Colonies

Territories in the Americas, Africa, Asia, and Oceania that were part of the Spanish Empire from the late 15th century through the 19th century.