QUESTION:
How much distance does the Hubble cover in one orbit?

ANSWER from Marc Buie on May 26, 1996:
The Hubble Space Telescope orbits the Earth in a nearly circular path.
The radius of this circle is about 6800 km, so that means the path
around the circle (or one orbit) is about 43,000 km.  It only takes about
90 minutes to travel that distance.  That means HST is traveling overhead
at over 28,000 km per hour.  Pretty fast, isn't it?