... 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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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.
它们表明，在灶神星表面曾有过多种演化过程，并为灶神星与行星相似提供了广泛的依据。
They show that a variety of processes were once at work on the surface of Vesta and provide extensive evidence for Vesta's planetary aspirations.
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