noun
two-body problem
In physics, the problem of determining the motion of two interacting bodies, such as in classical mechanics or celestial mechanics.
二体問題は、ケプラーの法則を使って解くことができる。
The two-body problem can be solved using Kepler's laws.
The three-body problem, which is generally more complex and chaotic than the two-body problem.
From 二 (two) + 体 (body) + 問題 (problem), a direct translation of the English physics term 'two-body problem'.