From the time this thread started to present I feel an incredible loss of time reading it...
Damn...
However Speed of Sound is irrelevant.
Sound is an event that requires pressure.
The boom you hear is not akin to light but the vibration of matter ebbing from the source that has reached a speed that exceeds environmental pressure.
For example a sonic boom will not occur at the same exact speeds at different parts of the planet.
Light and Sound have little in common theoretically speaking.
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