2. 职称英语
  3. According to the discoveries of the astronomers, when did galaxies form? [br] Wh

According to the discoveries of the astronomers, when did galaxies form? [br] Wh

游客2023-09-15  129
问题 According to the discoveries of the astronomers, when did galaxies form? [br] 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 ever 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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