传统的理论认为它一定像一颗恒星那样是由一团星际气体形成的压缩星云组成的。
Conventional theory suggests that it must have formed like a star, from a collapsing cloud of interstellar gas.
猎户座大星云区这是猎户星座的部分近照，图中粉红色旋转着氢气云团，暗色的是星际尘埃团。
Orion Nebula Area by Fabian Neyer. A deep image of part of the constellation of Orion showing swirling pink clouds of hydrogen and dark clumps of interstellar dust.
在银河系中还观测到大小，密度和质量都要大得多的冷星际物质团。
We observe in the galaxy much larger, denser, and more massive aggregates of cold interstellar matter.
图中可见分层的雾团，它覆盖着土星的月亮——泰坦；这幅图像由星际旅行者1号于1980年11月1日在距离泰坦22000公里(合约13700英里)的高度拍摄而成。
Layers of haze covering Saturn's moon Titan are seen in this image taken by Voyager 1 on Nov. 12, 1980 at a range of 13,700 miles (22,000 kilometers).
图中可见分层的雾团，它覆盖着土星的月亮——泰坦；这幅图像由星际旅行者1号于1980年11月1日在距离泰坦22000公里(合约13700英里)的高度拍摄而成。
Layers of haze covering Saturn's moon Titan are seen in this image taken by Voyager 1 on Nov. 12, 1980 at a range of 13,700 miles (22,000 kilometers).
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