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1·Computer simulations show that if there is more than one giant planet in a solar system's family, they will perform a kind of gravitational arm-wrestling match, making their orbits unstable.

电脑模拟显示，如果在一个恒星系统中有超过一个巨行星存在的话，它们会上演一场“重力掰手腕”比赛，这会使得它们的轨道变得不稳定。