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- They tower above the surface of a molecular cloud on the edge of the nebula. 它们从星云底部的一片分子云表面耸立而出。
- An approximately one-light-year tall "pillar" of cold hydrogen towers above the wall of the molecular cloud. 从分子云墙上耸立出来的一个大约1光年高的冷氢气柱。
- The Pleiades nebulosity is caused by a chance encounter between an open cluster of stars and a molecular cloud. 昴星团是在一次偶然的机会下，由一个疏散星团与一个分子星云遭遇而形成的。
- What used to be considered a hole in the sky is now known to astronomers as a dark molecular cloud. 这里的天空曾被认为是一个洞，而如今天文学家们都知道这是一片黑暗的分子云。
- Explanation: Cradled in glowing hydrogen, stellar nurseries in Orion lie at the edge of a giant molecular cloud some1,500 light-years away. ( 说明：猎户座众多恒星形成区位在巨大分子云团的边缘，离我们大约1,500光年远，包覆在光亮的氢气云之中。
- Explanation: Stars are forming in a dense molecular cloud a mere 1,000 light-years away in the constellation Serpens Cauda (The Serpent's Tail). 说明： 恒星正在一团致密的分子云内形成，其距离我们大约1,000光年远，位于巨蛇座尾部。
- M78 belongs to the larger Orion Molecular Cloud Complex that contains the Great Nebula in Orion and the Horsehead Nebula. M78属于猎户座复杂大分子云的一部分，而猎户座大星云和马头星云也包含在其中。
- Explanation: Cradled in glowing hydrogen, stellar nurseries in Orion lie at the edge of a giant molecular cloud some 1,500 light-years away. 说明：猎户座众多恒星形成区位在巨大分子云团的边缘，离我们大约1,500光年远，包覆在光亮的氢气云之中。
- Far from your own neighborhood on planet Earth, they lurk at the edge of the Cepheus Flare molecular cloud complex some 1,200 light-years away. 它们可比你在地球上的街坊邻居远得多，潜藏在仙王座炫光分子云复合体的边缘地带，离我们大约1,200光年。
- Explanation: One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. 解释：天空中最容易辨认的星云之一，猎户座的马头星云，是巨大而黑暗的分子云的一部分。
- One of the most identifiable nebulae in the sky, the Horsehead Nebula in Orion, is part of a large, dark, molecular cloud. 说明：猎户座内的马头星云是天空中最易辨认的星云之一，它是巨大黑暗分子云的一部分。
- The view reveals extensive nebulosities associated with the giant Orion Molecular Cloud complex, itself hundreds of light-years across. 这张影像揭示了大量的星云状物质和具有数百光年大小的巨大猎户座分子云。
- It starts with a core of increased density in a molecular cloud and ends with the formation of a T Tauri star, which then develops into a main sequence star. 但是因为总能量的守恒，因此伴随著重力能量的减少，微粒的动能就必须相对的增加。
- Like the Horsehead, the Flame, and the Orion Nebula itself, M78 is a readily visible part of the large Orion Molecular Cloud complex some 1,500 light-years distant. 像马头星云、火焰星云和猎户座星云本身一样，M78是猎户座分子云复合体中比较容易观测到的一部分，距离我们大约1,500光年。
- These turbulent velocities compress the gas in shocks, which generate filaments and clumpy structures within the giant molecular cloud over a wide range of sizes and densities. 这些湍流的速度压缩气体产生震波，通常会在巨分子云尺度和密度的广大范围内引发丝状和团块的结构。
- It is especially suited for the study of molecular clouds in the Milky Way. 它特别适合于研究银河系里的分子云团。
- A cloud is a mass of vapor in the sky. 云是天空中的水汽团。
- Some nebulae appear to be completely engulfed by exceedingly large molecular clouds. 有些气体星云似乎被极其巨大的分子云完全包围。
- Located at the edge of an otherwise invisible giant molecular cloud complex, these eye-catching nebulae represent only a small fraction of this galactic neighborhood's wealth of interstellar material. 可以看到该星云位于一个复杂而又巨大的分子云边缘附近，这引人注目的星云只是这个巨大临近的星际物质团的一小部分。
- This deep telescopic image from the early 21st century captures a tantalizing array of Barnard's dusty nebulae toward the constellation Taurus and the Taurus molecular cloud some 400 light-years away. 这种根深蒂固的伸缩图像从21世纪初捕捉诱人的一系列巴纳德的尘埃星云对星座金牛座和金牛座分子云约400光年。
