Astronomers will tell you that they are born in the collapse of primordial clouds of gas and dust.

天文学家们会告诉你，它们诞生于原始的由气体和尘埃组成的云团的崩溃。

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Diffuse, huge clouds of gas and dust relatively close to us in our galaxy can be seen above and below this band.

在光带的上方和下方，我们可以观察到由气体、尘埃组成的弥散而又巨大的云团，这些云团在我们星系中相对距我们比较近。

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As light from a quasar travels through space, it passes through clouds of gas that imprint absorption lines onto its spectrum.

当光从一个类星体划过太空，便会穿过将吸收线特征印在光谱上的气体云。

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It will study the clouds of gas and dust that go into making stars and planets.

BBC: Alma telescope: Ribbon cut on astronomical giant

It is obscured by vast clouds of gas and dust in the constellation of Sagittarius.

BBC: By BBC News Online Science Editor Dr David Whitehouse

This technology has allowed Herschel to study the processes at play as large clouds of gas and dust collapse to form new stars.

BBC: Herschel space telescope to go blind