Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
"In the anacoustic zone above 160 kilometres (99 mi), the density is
so low that molecular interactions are too infrequent to permit the
transmission of sound."
http://en.wikipedia.org/wiki/Thermosphere