SSS 2008-09-17
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ?
We live in a nice neighborhood. Of the galaxy 1, that is. The sun is about halfway 2 toward the outer edge of the Milky 3 Way. But the sun may have migrated vast distances through the galaxy to wind up where we are today. That’s according to computer models published in the September 10th Astrophysical Journal Letters.
By about nine billion years ago, the material for the galactic disk had mostly come together, but the actual disk formation hadn’t started. Scientists simulated the formation and evolution of the galaxy from that point, using over 100,000 hours of time on a University of Texas supercomputer and a computer cluster at the University of Washington.
Turns out that while a star is orbiting around the center of the galaxy, a spiral arm can intercept 4 the star and radically 5 alter that orbit. Which would explain a long-standing problem—the stars in our region have a much more varied 6 chemistry than would be expected. Stellar migrations 7 could thus be responsible for making our neighborhood within the Milky Way a much more diverse and interesting place.
Thanks for the minute for Scientific American's 60-Second Science. I'm Steve Mirsky .
- The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
- The company has a galaxy of talent.该公司拥有一批优秀的人才。
- We had got only halfway when it began to get dark.走到半路，天就黑了。
- In study the worst danger is give up halfway.在学习上，最忌讳的是有始无终。
- Alexander always has milky coffee at lunchtime.亚历山大总是在午餐时喝掺奶的咖啡。
- I like a hot milky drink at bedtime.我喜欢睡前喝杯热奶饮料。
- His letter was intercepted by the Secret Service.他的信被特工处截获了。
- Gunmen intercepted him on his way to the airport.持枪歹徒在他去机场的路上截击了他。
- I think we may have to rethink our policies fairly radically. 我认为我们可能要对我们的政策进行根本的反思。
- The health service must be radically reformed. 公共医疗卫生服务必须进行彻底改革。
- The forms of art are many and varied.艺术的形式是多种多样的。
- The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。
- It foundered during the turmoils accompanying the Great Migrations. 它在随着民族大迁徙而出现的混乱中崩溃。 来自辞典例句
- Birds also have built-in timepieces which send them off on fall and spring migrations. 鸟类也有天生的时间感应器指导它们秋春迁移。 来自互联网