Composed primarily of ices, most comets circle the dark fringes of the solar system, barely within the sun's gravitational grasp.
大部分彗星主要由冰块构成，环绕太阳系黑暗的边缘运行，几乎超出了太阳的引力范围。
Composed primarily of ices, most comets circle the dark fringes of the solar system, barely within the sun's gravitational grasp.
大部分彗星主要由冰块构成，环绕太阳系黑暗的边缘运行，几乎超出了太阳的引力范围。
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