A test of general relativity using radio links with the Cassini spacecraft

@article{Bertotti2003ATO,
  title={A test of general relativity using radio links with the Cassini spacecraft},
  author={Bruno Bertotti and Luciano Iess and Paolo Tortora},
  journal={Nature},
  year={2003},
  volume={425},
  pages={374-376}
}
According to general relativity, photons are deflected and delayed by the curvature of space-time produced by any mass. The bending and delay are proportional to γ + 1, where the parameter γ is unity in general relativity but zero in the newtonian model of gravity. The quantity γ - 1 measures the degree to which gravity is not a purely geometric effect and is affected by other fields; such fields may have strongly influenced the early Universe, but would have now weakened so as to produce tiny… 
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