All are trillions of miles away - three of them orbiting the same star, and the fourth circling a different star.
四颗全都在几兆英里之外，其中三个围绕同一恒星周围轨道运行，第四个围绕另一颗不同的恒星运行。
All are trillions of miles away - three of them orbiting the same star, and the fourth circling a different star.
四颗全都在几兆英里之外，其中三个围绕同一恒星周围轨道运行，第四个围绕另一颗不同的恒星运行。
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