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Originally Posted by John Kierein
http://www.newtonphysics.on.ca/Anomalous/Acceleration.html
This says it's due to dust in the Kuiper belt. Whaddaya think of that?
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This article submitted to a journal for review finds the following:
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In this work we study the gravitational influence of the material extending from Uranus orbit to the Kuiper belt and beyond on objects moving within these regions. We conclude that a density distribution given by rho(r) ~ 1/20r (for r > 20 AU) generates a constant acceleration towards the Sun on those objects, which accounts for the blue shift detected on the Pioneers space crafts. We also discuss the effect of this gravitational pull on Neptune, and comment on the possible origin of such
a matter distribution.
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