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。
2
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.