行星環
行星環（Planetary ring）係指圍繞住行星運轉嘅宇宙塵同小顆粒形成扁平盤狀嘅區域。最出名嘅行星環就係圍繞住土星嘅土星環，但係太陽系嘅其他三粒氣體大行星（木星、天王星同海王星）都有自己嘅行星環。
行星環嘅相
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