Planet X Cover-Up: Search 2

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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. The space agency said
    that persistent irregularities in the orbits of Uranus and
    Neptune "suggest some kind of mystery object is really
    there" with its distance depending on what it is. If the
    mystery object is a new planet, it may lie five billion miles
    beyond the outer orbital ring of known planets, the space
    agency said. If it is a dark star type of objet, it may be 50
    billion miles beyond the known planets; if it is a black
    hole, 100 billion miles. A black hole is a hypothetical body
    in space, believed to be a collapsed star so condensed that
    neither light nor matter can escape from its gravitational
    field.

Newsweek
Does the Sun Have a Dark Companion?
June 28 1982

    When scientists noticed that Uranus wasn't following its
    predicted orbit for example, they didn't question their
    theories. Instead they blamed the anomalies on an as yet
    unseen planet and, sure enough, Neptune was discovered in
    1846. Now astronomers are using the same strategy to
    explain quirks in the orbits of Uranus and Neptune.
    According to John Anderson of the Jet Propulsion Laboratory
    in Pasadena, Calif., this odd behavior suggests that  the sun
    has an unseen companion, a dark star gravitationally bound
    to it but billions of miles away. ... Other scientists suggest
    that the most likely cause of the orbital snags is a tenth
    planet 4 to 7 billion miles beyond Neptune. A companion
]   star would tug the outer planets, not just Uranus and
    Neptune, says Thomas Van Flandern of the U.S Naval
    Observatory. And where he admits a tenth planet is
    possible, but argues that it would have to be so big - a least
    the size of Uranus - that it should have been discovered by
    now. To resolve the question, NASA is staying tuned to
    Pioneer 10 and 11, the planetary probes that are flying
    through the dim reaches of the solar system on opposite
    sides of the sun.