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Science Bowl Question

📅 NSB Double Elimination 2012🎓 HS🔄 Round 2#️⃣ Q11 TOSS UP📝 Multiple Choice

How is it known that the engine powering active galactic nuclei, or AGN, must be at most several hundred AU in size?

W) AGN that have been spatially resolved indicate that they cannot be any larger
X) The timescale on which gas is observed to cool is comparable to the sound crossing time of several hundred AU
Y) The timescale on which AGN vary is the light crossing time of several hundred AU
Z) The orbits of stars around AGN are only several hundred AU in diameter
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