Testing Gravity in the Outer Solar System: Results from Trans-Neptunian Objects

  title={Testing Gravity in the Outer Solar System: Results from Trans-Neptunian Objects},
  author={J. F. E. Wallin and David S. Dixon and Gary L. Page},
  journal={The Astrophysical Journal},
The inverse square law of gravity is poorly probed by experimental tests at distances of ~10 AU. Recent analysis of the trajectory of the Pioneer 10 and 11 spacecraft have shown an unmodeled acceleration directed toward the Sun, which was not explained by any obvious spacecraft systematics, and occurred when at distances greater than 20 AU from the Sun. If this acceleration represents a departure from Newtonian gravity or is indicative of an additional mass distribution in the outer solar… Expand

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