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How big is 洞穴星云?

700 trillion kilometers!

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洞穴星云

Cave Nebula 是非常瀰漫的星云. 当然, 大部分像它这麽大的星云都很暗, 所以你需要很长 的曝光时间才看得见它. 洞穴星云也被称作 Sh2-155 或 Caldwell 9.

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Scale of the Universe > 洞穴星云

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