2014届最新高考英语一轮单元复习 精品阅读理解提升文章精选一百篇(96).doc
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1、2014届最新高考英语一轮单元复习 精品阅读理解提升文章精选一百篇(96)Unit 95Scientists Look Forward to the PastCan time travel really be done? Physicists think that travel into future is possible. Einsteins special theory of relativity, published in 1905, predicted that time should be elastic, stretching or shrinking as an observe
2、r moves. To get a really big time leap it is necessary to travel at near the speed of light - 300,000 km per second. At 99% of this speed, a rocket trip to a distant star and back would take 15 months, but travelers would return home to find that nearly nine years had elapsed on Earth. In effect, yo
3、u would have leapt several years into Earths future.Gravity offers another way to slow time. On the earths surface, clocks tick a little slower than on the moon, for example. Near a neutron star or black hole, gravity is so intense that time is slowed to a crawl relative to us. These facts are accep
4、ted by almost all scientists. Traveling forwards in time has been demonstrated convincingly in experiments. But the possibility f traveling backwards in time is far more controversial. The first hint that it might be possible came in 1932, when a physicist named Stockhum investigated what might happ
5、en to an observer who orbits a rapidly spinning cylinder. He showed it was possible to travel in a closed loop and return to your starting point before you left.Worm holes are like black holes, with a key difference. Whereas black holes offer a one-way journey to nowhere - fall in and you never get
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