Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars.
尽管它的视觉效果如此显著，但尘埃只是位于恒星之间的物质的一个次要组成部分，其密度极低。
He saw that the constituent parts were being separated, with hydrogen gas falling into the star while water vapour remained farther out and the dust was farther out still.
他发现组成部分正在分离——氢气落入恒星里面，而水蒸汽留在外围，尘埃还在更外面。
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