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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
19
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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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