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What story does the three-body novel tell?

Three-body is about a group of aliens. Their home planet has three suns. For some reason, this three-body system is unstable and will easily collapse, so they are going to change places to live. Three-body is preparing for interstellar migration, but the universe is so big, it is dark everywhere, and I don't know where to migrate, so three-body got thousands of space stations to monitor signals and see if there is any connection.