... 行星系（统） planetary system; 行星相 phase of planets; 行星小齿轮 planet pinion; planetary pinion; ...
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行星相互位置图 planetary configurations
镜广域行星相机 Wide Field Camera
广角行星相机 Wide Field Planetary Camera ; WFPC
第二代广角行星相机 WFPC ; Wide Field Planetary Camera
行星相机 Wide Field and Planetary Camera
二代广角行星相机 Wide Field Planetary Camera
无相位行星 Unaspected Planets
有两组行星之间成对相 Grand Cross
行星波相互作用 planetary waves interactions
彗星在组成上与气态巨行星相似。
众所周知，与其他岩石行星相比，水星的密度很高。
Mercury is known to have a high density in comparison with other rocky planets.
这是个振奋的消息，因为两个缓慢运动的行星相遇3次总是预示着一次转变。
This is sensational news because three meetings of two slow moving planets always suggest the possibility for a transformation.
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