look at: http://homepage.univie.ac.at/Franz.Embacher/Rel/
In general relativity the Lense-Thirring effect is a relativistic correction to the precession of a gyroscope near a large rotating mass such as the earth.
A rotating mass slightly drags the metric of space-time along with it, twisting it a little or in the extreme case, creating a vortex like structure in space-time.
A free-falling object from the 'OFF' no longer moves in a straight line toward the center of a spherical central mass if it is rotating.
Epstein Explains Einstein
An Introduction to both the Special and the General Theory of Relativity
“As simple as possible - but not simpler !”
by David Eckstein
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