That is a dark cloud/dust in space.

来源: pieq314 于 2011-11-26 20:08:13 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (85 bytes)
回答: 厉害！黑乎乎的东东是啥？ 由 梦中画 于 2011-11-25 18:15:27

So essentially, there is a dark cloud in front of a bright cloud further away.

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