While different atmospheres have different speeds at which Mach can be breached depending on composition (density and whatnot of the gas) and how light the atmosphere is, I was thinking about how fast Mach would be on different planets. As an example, Mach on Earth is 343~ m/s while on Mars it's 240~ m/s. I think it'd be cool to be able to break the sound barrier on planets with atmospheres and being able to push Mach's varied speeds on different planets.
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