At about 245 miles altitude, the International Space Station is the third-brightest object in the sky and can be seen from earth. You need to know where to look though, so there's an app for that.
Its velocity is 17,500 miles per hour, fast enough to go all the way around the earth every 92 minutes. The moon takes a whole month to go around the earth. Watch below for a quick explanation of the significance of those orbit speeds:
from Space
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