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<p>and the <a href="page.php?w=Sun">Sun</a>. In an extended modern sense, a three-body problem is any problem in classical mechanics or <a href="page.php?w=quantum_mechanics">quantum mechanics</a> that models the motion of three particles.</p>

<p><big> Mathematical description </big></p>
<p>The mathematical statement of the three-body problem can be given in terms of the Newtonian equations of motion for vector positions  of three gravitationally interacting bodies with masses : where  is the <a href="page.php?w=gravitational_constant">gravitational constant</a>.</p><p>
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