Quasars are the highly energetic cores of distant galaxies.
类星体是遥远星系的极为活跃的核心体。
Quasars are the highly energetic cores of distant galaxies.
类星体是遥远星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
星系。
Explanation: Across the heart of the Virgo Galaxy Cluster lies a string of galaxies known as Markarian's Chain.
说明： 贯穿室女座星系团心脏有一条星系链，
称为马卡林之链。
Steidel）及其同事所发展，它能使观测者
于遥远星系的大量目录，这些星系的恒星光也许曾助长了星系际气体的再游离。
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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