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A comment on Are Those Spidery Black Things On Mars Dangerous?. Parent comment

Re:Are Those Spidery Black Things On Mars Dangerous? by JonnieCache on Wednesday October 03, 2012 @06:13PM (#4609887)
Mach 1 where?
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Re:Are Those Spidery Black Things On Mars Dangerous? by goodcanadian on Wednesday October 03, 2012 @07:52PM (#4610221)
Mach 1 always means the speed of sound in the local environment.
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Re:Are Those Spidery Black Things On Mars Dangerous? by stephengillie on Wednesday October 03, 2012 @07:50PM (#4610213)
On Mars. Mach, the speed of sound (vibrations), varies with changes in heat, density, etc.
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