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mknutson
July 24th, 2009, 09:01 AM
anacoustic zone
The region of Earth's atmosphere (http://www.daviddarling.info/encyclopedia/E/Earthatmos.html) where distances between rarefied air molecules are so great that sound waves can no longer propagate. Also known as the zone of silence.

seekfun
July 24th, 2009, 09:58 AM
MKnutson,

Thanks for sharing. This was incredibly interesting, and the article reminded me of the book Magnificent Failure, about Nick Piantanida's efforts to jump from a balloon in the Stratosphere.

[/url][url="http://www.amazon.com/Magnificent-Failure-Free-Fall-Space/dp/1588341410"][url="http://www.amazon.com/Magnificent-Failure-Free-Fall-Space/dp/1588341410"]Amazon.com: Magnificent Failure: Free Fall from the Edge of Space (9781588341419): Craig Ryan: Books (http://www.amazon.com/Magnificent-Failure-Free-Fall-Space/dp/1588341410)

Cheers,

topher