Visible in the distant background sky is the band of our Milky Way galaxy, the Pleiades open clusters of stars, and the Andromeda galaxy.
在遥远的背景天空中的是我们银河系的光带、昴星团，以及仙女座星云。
The smallest looser 'open clusters' have only a few stellar members, whilst the largest tightly bound' globular clusters' have as many as several million stars.
最小的疏散星团里只有几个恒星，而最大的球状星团则由多达几百万颗恒星密集而成。
On Deep-sky objects, the eyepiece continued to do quite well, showing many faint stars in open clusters.
在观测深空天体时，它仍然有很出色的表现，它分解出了许多疏散星团中暗弱的星点。
Studies of the dynamics and formation process of open clusters are of great significance for stellar dynamics and star formation in the Galaxy.
疏散星团动力学及形成过程的研究对于恒星动力学理论和银河系恒星形成理论具有重要意义。
It also shows that all globular clusters in our Galaxy are very old, much older than the oldest open clusters in the Galactic disk.
球状星团与疏散星团年龄相比要老得多，表明它们是在银河系形成初期形成的恒星系统。
We also describe the basic principle of White Dwarf cosmochronology and its application in defining the age of the Galactic disk, globular clusters, open clusters and Galactic halo.
介绍了白矮星宇宙纪年学研究的基本原理及其在银盘、球状星团、疏散星团以及银晕年龄确定方面的应用现状。
The mass segregation effects of open clusters, including spatial mass segregation and velocity mass segregation, are of great importance for studies of formation and evolution of clusters.
对疏散星团质量分层的有关问题做了简要的评述，包括空间质量分层和速度质量分层的表现形式和探测途径，质量分层形成机制的研究现状。
Open clusters NGC 869 and NGC 884, however, are doubly impressive.
不过疏散星团NGC 869和 NGC 884 则是令人叹为观止的。
Open clusters, in general, are loosely bound and they disperse over hundreds of millions of years.
疏散星团，通常来讲，结构松散并且在几亿年中持续分散。
Open clusters, in general, are loosely bound and they disperse over hundreds of millions of years.
疏散星团，通常来讲，结构松散并且在几亿年中持续分散。
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