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The diagram above appeared in the 1987 edition of the "New Science and Invention Encyclopedia", published by H.S. Stuttman, Westport, Connecticut, USA.

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New York Times

June 19, 1982

 

A pair of American spacecraft may help scientists detect what could be a 10th planet or a giant object billions of miles away, the national Aeronautics and Space Administration said Thursday. Scientists at the space agency's Ames Research Center said the two spacecraft, Pioneer 10 and 11, which are already farther into space than any other man-made object, might add to knowledge of a mysterious object believed to be beyond the solar system's outermost known planets.

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New York Times

January 30, 1983

 

Something out there beyond the farthest reaches of the known solar system seems to be tugging at Uranus and Neptune. Some gravitational force keeps perturbing the two giant planets, causing irregularities in their orbits. The force suggests a presence far away and unseen, a large object that may be the long- sought PlanetX.

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Uploaded on July 21, 2010
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