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  An asteroid the size of the Great Pyramid of Giza in Egypt, is barrelling towards Earth and NASA have revealed the exact date it could strike our planet.


  barrel [ˈbærəl]:v.快速移动

  NASA have released details of an asteroid, known as JF1, that is heading towards Earth. The rock, a whopping 420ft across, is predicted to collide with the planet on May 6, 2022, with devastating consequences. The American space agency have said that if the asteroid continues on its current trajectory, it could strike with a force of 230 kilotons (230,000 tonnes of TNT).


SA视讯   trajectory [trəˈdʒektəri]:n.轨道

  The impact would be more than 15 times larger than the atomic bomb dropped on Hiroshima in 1945, which liberated energy equivalent to approximately 15 kilotons of TNT.

SA视讯   这颗小行星如果撞击地球,带来的影响将是1945年投放在广岛的原子弹的15倍以上,广岛原子弹释放出的能量相当于约1.5万吨TNT炸药。

SA视讯   Scientists have said that if JF1 were to hit a populated area, it would wipe out an entire city instantly, potentially causing millions of deaths.


  But they warn that even if it were to splash down in the remotest part of the Pacific Ocean it would still cause devastating tsunamis and a “nuclear winter” that could severely impact life on Earth.


SA视讯   As a result, the asteroid has been flagged for close attention by their near-Earth monitoring system, Sentry.


  NASA said: “Sentry is a highly automated collision monitoring system that continually scans the most current asteroid catalogue for possibilities of future impact with Earth over the next 100 years.”

SA视讯   美国国家航空航天局表示:“‘哨兵’是一个高度自动化的碰撞监测系统,它不断扫描最新的小行星目录,以寻找未来100年与地球相撞的可能性。”