Quasars are the highly energetic cores of distant galaxies.
类
体是
系的极为活跃的核心体。
系；银河系（galaxy的复数）Quasars are the highly energetic cores of distant galaxies.
类体是系的极为活跃的核心体。
We still don't know how many galaxies there are in the universe.
我们还不知道宇宙中有多少个系。
Explanation: Across the heart of the Virgo Galaxy Cluster lies a string of galaxies known as Markarian's Chain.
说明： 贯穿室女座系团心脏有一条系链，
称为马卡林之链。
Steidel）及其同事所发展，它能使观测者建立关于
系的大量目录，这些系的恒光也许
助
了系际气体的再游离。
Steidel of Caltech and his colleagues, has enabled observers to build up sizable catalogues of distant galaxies—whose starlight may have helped reionize intergalactic gas.
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