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What causes this?

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Old 07-25-2008 | 10:10 PM
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Default What causes this?

What causes the rings in the exhaust?

Photos: SABCA F-16AM Fighting Falcon Aircraft Pictures | Airliners.net
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Old 07-25-2008 | 10:16 PM
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The afterburner has multiple stages in it. If that's not why, I can't tell ya.
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Old 07-25-2008 | 10:30 PM
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A cool sight indeed,

for an answer, another site:

Aerospaceweb.org | Ask Us - Shock Diamonds and Mach Disks
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Old 07-25-2008 | 10:49 PM
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Thanks! Interesting read.
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Old 07-26-2008 | 05:34 AM
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yeah, I was gonna say, its shockwaves, but thanks for the cool article! A much better answer than mine...
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