Simulations show how the orbits of planets gravitationally scattered outward might be perturbed by passing stars within the star’s birth cluster, leading to the planets becoming stranded on wide orbits — such as hypothetical Planet Nine. These results lead to the prediction of a rich population of very-wide-orbit planets in the Galaxy.

中文翻译：

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超宽轨道行星的起源

模拟显示了引力向外散射的行星的轨道如何受到恒星诞生星团内经过的恒星的扰动，从而导致行星搁浅在较宽的轨道上——例如假设的第九行星。这些结果导致了银河系中大量极宽轨道行星的预测。