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托福听力练习-科学美国人60秒:地球周围时空漩涡

2017-05-05 09:11:00来源：新东方在线整理

点击查看>>科学美国人60秒音频：地球周围时空漩涡

　　科学美国人60秒听力练习：地球周围时空漩涡

　　科学美国人60秒英文文本

　　Albert Einstein wins again. A new study hasconfirmed another prediction of his theory ofgeneral relativity. The corroboration appears online inthe journal Physical Review Letters. [Francis Everittet al., citation to come.]

　　Einstein’s theory recognizes that massive objectswarp the very fabric of space and time. If thetheory is true, then the Earth should stretch the spacetime in which it sits, like a bowling ballwould deform a trampoline. What’s more, the Earth’s rotation should also produce a drag onlocal spacetime, like a marble spinning in molasses would pull the goop around it.

　　To measure these minor deformations, scientists sent four gyroscopes into space in a missioncalled Gravity Probe B. And they found that after circling the Earth some 5000 times thegyroscopes’ angle of spin had changed, ever-so-slightly, in response to the Earth’sgravitational pull. Which proves that the old man was right.

　　Gravity Probe B was first conceived in 1959. [1976 paper envisioning the experimentalsetup] And the technology created to make the mission fly has been applied in work on the bigbang theory—the real theory, not the TV show—and in GPS. Which Einstein would have loved. Because even a genius can get lost on the highway.

　　—Karen Hopkin


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本文关键字: 托福听力 科学美国人60秒

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