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This history shows more and more evidence of a tenth planet building for over 1/2 a century, all the way up to this statement in 1987.

In 1987, John Anderson at JPL examined the motions of the spacecraft Pioneer 10 and Pioneer 11, to see if any deflection due to unknown gravity forces could be found. None was found -- from this Anderson concluded that a tenth planet most likely exists! JPL had excluded observations of Uranus prior to 1910 in their ephemerides, while Anderson had confidence in the earlier observations as well. Anderson concluded that the tenth planet must have a highly elliptical orbit, carrying it far away to be undetectable now but periodically bringing it close enough to leave its disturbing signature on the paths of the outer planets. He suggests a mass of five Earth masses, an orbital period of about 700-1000 years, and a highly inclined orbit. Its perturbations on the outer planets won't be detected again until 2600. Anderson hoped that the two Voyagers would help to pin down the location of this planet. ...

Now suddenly this Statement, the last paragraph, and a half a century of careful observation are thrown out the window. One has to think about where did the data about voyager come from. One source NASA. It had to be interpreted only by NASA and published by them. No one else had access. Then what, every astronomer then bows down to this manufactured lie. This is supposed to be end of story. I wonder how many astronomers have bought it.

The Voyagers also yielded more accurate masses for the outer planets - when these updated masses were inserted in the numerical integrations of the solar system, the residuals in the positions of the outer planets finally disappeared. It seems like the search for "Planet X" finally has come to an end.

Offered by Mike.