大多数星系是在100多亿年前悄然诞生的,起初它们只是一些小的气团和星团,之后渐渐合并成一些较大的类似银河系的天体。但是,在那次初始的星体诞生潮过后,星系的诞生速度明显减慢。因此,天文学家必须穿过100亿光年的较老星系,才能够窥视到星系所由之发育扩展的那些小而模糊的初生天体。但是,现在用太空望远镜在20到40亿光年处,发现 Most galaxies were quietly built more than 10 billion years ago. At first they were just small air masses and star clusters. They gradually merged into larger galaxies like the Milky Way. However, the galaxy’s birth rate slowed significantly after the initial star birth. Therefore, astronomers must go through 10 billion light-years of older galaxies to be able to peer into the small and obscure primary celestial bodies that the galaxy has developed. However, it is now discovered with space telescopes at 20 to 4 billion light years.