【万物简史】PART IV CH 13砰！（6）_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 IV CH 13砰！（6）

听力简介：

小行星散落在木星和火星之间。互相之间的平均距离有百万英里（150万公里）。最早发现小行星的是意大利人朱塞比•皮亚齐。起初他以为小行星是真正意义上的行星。而后，威廉•赫歇尔多次推演后，得算出他们远比行星小得多。

❤《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:

Jumble
Roomy
deductions
William Herschel

Asteroids, as most people know, are rocky objects orbiting in loose formation in a belt between Mars and Jupiter. [---1---] Nobody knows even approximately how many asteroids there are tumbling through space, but the number is thought to be probably not less than a billion. They are presumed to be planets that never quite made it, owing to the [-2-] gravitational pull of Jupiter, which kept—and keeps—them from coalescing.

When asteroids were first detected in the 1800s—the very first was discovered on the first day of the century by a Sicilian named Giuseppi Piazzi—they were thought to be planets, and the first two were named Ceres and Pallas. [---3---] He called them asteroids—Latin for "starlike"—[---4---] Sometimes now they are more accurately called planetoids.