多た体たい問もん題だい

noun

n-body problem; many-body problem

Technical term in physics for the problem of predicting the motion of a group of celestial objects or particles interacting with each other gravitationally or through other forces.

• 多た体たい問もん題だいは天てん体たい力りき学がくの基き本ほん的てきな課か題だいの一ひとつです。

  The n-body problem is one of the fundamental challenges in celestial mechanics.