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Tue, Sep 16, 2008

ANN's Daily Aero-Term (09.16.08): Optical Depth

Aero-Terms!

Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.

Aero-Terms should serve as a quick but intriguing reminder of the terms you may use every day, or an introduction to an aspects of the Aero-World you may not yet be familiar with. ANN also encourages readers to go beyond the FMI link, and further research any intriguing terms.

Suggestions for future Aero-Terms are ALWAYS welcome, as are additions or discussion of the explanations given for each Aero-Term.

Optical Depth

Optical depth is a measure of the transparency of a ring system. When a ring is "optically thick" (i.e., the optical depth is large), the ring is nearly opaque and very little light passes through. When a ring is "optically thin" (i.e., the optical depth is small), very little material is present and most of the light passes through.

FMI: www.astro-tom.com/getting_started/planetary_rings.htm

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