9MACH
equals
0
km/h
kilometers per hour
0
mph
miles per hour
0
m/s
meters per second
0
ft/s
feet per second
0
kn
knots
0
km/s
kilometers per second
0
cm/s
centimeters per second
0
mi/s
miles per second
Or, if you prefer: 0 furlongs per fortnight.
Mach 9, elsewhere
Mach isn't a fixed speed — it's relative to the local speed of sound. Same Mach 9, very different km/h depending where you are.
0
on Earth
sound: 340.3 m/s · sea level, 15°C
0
on Mars
sound: 240 m/s · surface, avg -63°C
0
on Venus
sound: 410 m/s · surface, ~464°C
0
on Titan
sound: 194 m/s · Saturn's moon, -179°C
0
on Jupiter
sound: 938 m/s · 1-bar level, -108°C
0
on Saturn
sound: 857 m/s · 1-bar level, -139°C
0
on Uranus
sound: 587 m/s · 1-bar level, -197°C
0
on Neptune
sound: 585 m/s · 1-bar level, -201°C
Gas giants have no surface, so their sound speed is taken at the 1-bar reference level. Figures are physics-based estimates (γRT/M) using each atmosphere's real composition and temperature — Mars and Titan are close to actual mission measurements.
How long it will take
Flying at Mach 9's Earth speed — 11,025.4 km/h — in a straight line, without stopping.
0
hours
to the Moon
0
months
to Mercury
0
months
to Venus
0
months
to the Sun
0
years
to Mars
0
years
to Jupiter
0
years
to Saturn
0
years
to Uranus
0
years
to Neptune
0
years
to Pluto
Distances are the midpoint between each body's closest and farthest approach to Earth — a simple stand-in for a true orbit-averaged distance. It's why Mercury, Venus, and the Sun land in roughly the same place.