Kilometers per second (km/s)
Kilometers per second (km/s) is a unit of speed that measures the number of kilometers traveled in one second. It is occasionally used in astronomy and astrophysics where large distances are involved.
Micons per second (μm/s)
Microns per second (μm/s) is a unit of speed. One meter is equivalent to 1,000,000 microns and this unit is the number of microns travelled in one second.