All the planets orbit the Sun in roughly the same plane, around its equator.
所有行星基本在同一个平面上围绕太阳赤道运转。
Most planets orbit in a plane that corresponds to their parent star's equator.
大多数行星都是在与母星赤道一致的平面上公转。
It's rare because the moon is usually either above or below the plane of Earth's orbit.
这是很少见的，因为月亮常常不是在地球轨道平面的上方就是在下方。
It's rare because the moon is usually either above or below the plane of Earth's orbit.
这是很少见的，因为月亮常常不是在地球轨道平面的上方就是在下方。
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