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The higher the amount of gear reduction, produces the most torque. The type of gear system usually used is a planetary type, due to its ability to withstand the strain.
Planetary Resources plans to mine asteroids.
spinning
A Planetary Nebula. See related question.
the type of paint that ends with n is green.
That's a planetary nebula within our Milky Way.
wheel
wheel and axle
It is a wheel and axle
planetary
both ends
The 2014 Jaguar F-TYPE has rear wheel drive.