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我相信有no frame-dragging effect of gravity on mass, only on electromagnetic energy!
Curiously, the Lense-Thirring effect in Gravity Probe B has the same value than the geodetic effect of the Earth around the Sun.
NASA error?
An interesting experiment!
Understanding Gravity Probe-B experiment without math
http://www.molwick.com/en/gravitation/082-gravity-probe-b.html
http://www.molwick.com/en/gravitation/r-lense-thirring-frame-dragging.jpg