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three-body problem

[three-bod-ee] /ˈθriˈbɒd i/
noun, Astronomy, Mechanics
the problem of calculating the motions of three bodies in space moving under the influence of only their mutual gravitational attraction.
Compare two-body problem. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for three body problem

three-body problem

in astronomy, the problem of determining the motion of three celestial bodies moving under no influence other than that of their mutual gravitation. No general solution of this problem (or the more general problem involving more than three bodies) is possible

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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