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In Search of Planet X

In Search of Planet X
In Search of Planet X After it encounters Neptune in August 1989 (see page 21), Voyager 2 will join its sister spacecraft—Pioneers 10 and 11 and Voyager 1—now racing through the outer reaches of our solar system. By carefully analyzing the radio signals from these spacecraft, scientists can determine what, if any, objects might be affecting the space craft gravitationally. If there is a Planet X orbiting the Sun outside of Pluto's orbit, these plucky robotic explorers may help us find it. The search begins on page 6. Voyager Mission Planning Office and the JPL Computer Graphics Laboratory