The answer depends on the context, may be:
- A problem in physics and classical mechanics that involves solving for the motion of three bodies that interact with each other through gravity or some other force. This problem is very difficult and has no general closed-form solution.
- A SF (science fiction) novel by the Chinese writer Liu Cixin, which is the first book of the Remembrance of Earth’s Past trilogy. The novel tells the story of humanity’s first contact with an alien civilization that lives in a star system with three suns. The novel won the Hugo Award for Best Novel in 2015.
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