Gravity Probe B: final results of a space experiment to test general relativity.

@article{Everitt2011GravityPB,
  title={Gravity Probe B: final results of a space experiment to test general relativity.},
  author={C. w. Francis Everitt and Daniel B. DeBra and Bradford W. Parkinson and John P. Turneaure and John W. Conklin and M. I. Heifetz and George M. Keiser and Alexander S. Silbergleit and T J Holmes and Jeffery J. Kolodziejczak and M Al-Meshari and John C. Mester and Barry Muhlfelder and V G Solomonik and K. Stahl and Paul W. Worden and William J. Bencze and Sasha Buchman and Bruce Clarke and A Al-Jadaan and H. Al-Jibreen and J. Li and John A. Lipa and James M. Lockhart and B Al-Suwaidan and Michael A Taber and S. Q. Wang},
  journal={Physical review letters},
  year={2011},
  volume={106 22},
  pages={
          221101
        }
}
Gravity Probe B, launched 20 April 2004, is a space experiment testing two fundamental predictions of Einstein's theory of general relativity (GR), the geodetic and frame-dragging effects, by means of cryogenic gyroscopes in Earth orbit. Data collection started 28 August 2004 and ended 14 August 2005. Analysis of the data from all four gyroscopes results in a geodetic drift rate of -6601.8±18.3  mas/yr and a frame-dragging drift rate of -37.2±7.2  mas/yr, to be compared with the GR predictions… 

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