https://blog.wongcw.com/2022/12/15/%e7%82%ba%e4%bb%80%e9%ba%bc%e6%9c%89%e4%ba%9b%e8%a1%8c%e6%98%9f%e8%a2%ab%e7%92%b0%e7%8b%80%e7%89%a9%e6%89%80%e5%8c%85%e5%9c%8d%ef%bc%9f/
為什麼有些行星被環狀物所包圍?