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This is a kind of silly question because you are dealing with object (stars, etc) that cannot exist in an atmosphere so treat the whole below as a bit of a lark. The decibel scale is logarithmic. 120 dB is one joule of sound energy. 130 Joules is ten times more: 10 Joules, 140 is 100 Joules etc. (Source) The loudest sound on Earth is said to be Krakatoa at ...

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