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?

选项

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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大学英语六级

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

大学英语六级

"Avoidtherush-hour"mustbethesloganoflargecitiesallovertheworld.Whereveryoulook,it’speople,people,people.The

TheBritishlikemoving.Theyregardtheopportunitytotravelfarandfrequentlyasaright.Somepeoplespenduptotwoorthr

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A、By10:00am.B、By9:00am.C、By8:30am.D、By8:00am.B对话中女士解释她迟到的原因是住的太远了，而且交通很糟糕，男士回答他知道，他也住在郊区，但是公司要求员工早上九点上班。由此可知，公司要求员工早

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Hisgoodsenseofhumormadeadeepimpression_________us.