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  3. According to the discoveries of the astronomers, when did galaxies form? Why can astronomers age galaxies by computing how much

According to the discoveries of the astronomers, when did galaxies form? Why can astronomers age galaxies by computing how much

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问题 According to the discoveries of the astronomers, when did galaxies form?
Why can astronomers age galaxies by computing how much the wavelength of their light has stretched?
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答案Because the universe has been expanding over since the big bang.
解析 根据题干中的关键词age galaxies和computing定位到第四段，可知宇宙自形成以来一直在扩张，因此天文学家可以通过计算星系中光线波长的延展度，来计算星系的年龄。
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