ROBERT SAYRE wrote in a message to MATT MC_CARTHY:

RS>  I envision a station that looks like a wide cylinder where you 
RS> could walk on the inside "wall" of the cylider and make a complete 
RS> circle back to your starting point. Your head would point towards
RS> the center of the station at all times. The faster the station 
RS> spun, the stronger the "gravity", so you could create just the 
RS> amount of "gravity" that you wanted.

The formula I've seen for making one of those goes like this:

Find an asteroid,  of a convenient size,  and get it into the orbit that
you want.  Drill a hole in it,  and fill it with water or ice.  Mount some
rocket motors on it,  getting it to spin.  Aim a big mirror to focus
sunlight on it,  heating it up until the rock softens and the water inside
turns to steam.  What you end up with is hollow...   :-)

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