Mach 1 ~= 760 mph (actual value depends a lot on air density)
speed of low earth orbit = Mach 23
escape velocity = Mach 33
(ratio of the above two is sqrt(2).)
earth's orbital speed around the sun = Mach 85 (also the typical speed of meteors)
sun's orbital speed around the center of the Milky Way galaxy = Mach 600
Local Group speed relative to cosmic microwave background rest frame = Mach 1800
speed of light = Mach 890000
"his speed is... over Mach 900,000!" "there's no way that can be right."
over 9000 hectomach.
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