【万物简史】PART III CH 11马斯特·马克的夸克（13）_英语听力练习mp3下载-科学-沪江听力酷

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【万物简史】PART III CH 11马斯特·马克的夸克（13）

听力简介：

天文学界对宇宙的理解同样不完整。埃德温·哈勃已经确认，我们视野里的几乎所有星系都在离我们远去，这种退行的速度和距离是成正比的。哈勃利用自己的等式，计算出宇宙的年龄大约为20亿年。完善这个数字是宇宙学界一直关心的事情。关于哈勃常熟，学界常年来对其意见不一~~~

❤《万物简史》推出部落节目版，戳这里订阅:http://bulo.yeshj.com/menu/6004/

文中需听写单词或词组用[-No-]表示，句子用[---No---]表示。请边听写边理解文意，这样可以提高听力准确度，并为训练听译打下基础哦~~~

Hints:
Hubble
ongoing
preoccupation

While physicists in the middle decades of the 20th-century were looking perplexedly into the world of the very small, astronomers were finding no less arresting an incompleteness of understanding in the universe at large.

When we last met Edwin Hubble, he had determined that nearly all the galaxies in our field of view are flying away from us, and that the speed and distance of this retreat are neatly proportional: [---1---] Hubble realized that this could be expressed with a simple equation, Ho = v/d (where Ho is the constant, v is the recessional velocity of a flying galaxy, and d its distance away from us). Ho has been known ever since as the Hubble constant and the whole as Hubble's Law. [---2---]—not least Earth itself—were probably older than that. [---3---]
Almost the only thing constant about the Hubble constant has been the amount of disagreement over what value to give it. In 1956, astronomers discovered that Cepheid variables were more variable than they had thought; they came in two varieties, not one. [---4---], but at least old enough, at last, to embrace the formation of the Earth.