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what used to be considered a hole in the sky is now known to astronomers as a dark molecular cloud.

我们曾认为这是天空中的一个孔洞，而现在，天文学家知道这是一片黑暗的分子云。

three nebulas contained inside the enormous orion molecular cloud located 1, 500 light-years from earth are shown in this mosaic wise image.

这张“智慧”镶嵌图像展示的是距离地球1500光年，猎户座大分子云团内的三大星云。

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。

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。

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.

explanation: one of the most identifiable nebulae in the sky, the horsehead nebula in orion, is part of a large, dark, molecular cloud.

解说：这是天空中最易辨认的星云之一。猎户中的马头星云是一个巨大的黑暗分子云的一部分。

the giant molecular cloud, mon r2, is impressively close, estimated to be only 2, 400 light-years or so away.

这个名为MonR2的巨大的分子云离我们非常近，据估计只有大概2400光年。

searches for massive molecular cloud cores with co isotopes

大质量分子云核的CO同位素搜寻

the entire cosmic vista spans over 30 light-years, near the edge of the orion molecular cloud complex some 1, 500 light-years distant.

这整张宇宙影像覆盖超过30光年，距离猎户座复杂分子云大约1,500光年远。

the nebula's glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1500 light-years away.

在这片离地球1500光年远的广大星际分子云的边缘，有一些发光的云气包围著年轻亮星。

A deep exposure shows everything from dark nebula to star clusters, all imbedded in an extended patch of gaseous wisps in the greater Orion Molecular Cloud Complex.

从深空的影像中显示，在猎户座分子云复合体之中，延展的云气丝藏了无数的黑暗星云到星团的补丁。

the complex is called the vela molecular cloud ridge, and may form part of the edge of the orion spiral arm spur in the milky way galaxy.

这片复合区域被称为船帆分子云脊（VelaMolecularCloudRidge），它可能参与形成了猎户座悬臂的边缘部分。

the spectacular horsehead nebula is actually a projection of cold gas and dust extending from the dense orion molecular cloud.

引人注目的马头星云实际上是低温气体和自稠密的猎户座分子云延伸而来的尘埃相互作用而形成的突起物。

the process blasted out material to form the bubble structure of glowing gas against denser material in a surrounding molecular cloud.

这个过程形成的炽热气泡结构恰好可以抵御周围分子云中密度更高物质的压力。