据美国宇航局科学家透露，周六发生在智利的强烈地震可能改变地球自转轴心线，并缩短地球自转时间，使一天时间变短。
The earthquake that struck Chile on Saturday may have shifted the earth's axis and created shorter days, according to scientists at Nasa.
据美国宇航局的报道称，环绕地球的太空垃圾已经到达了一个临界点，它们之间的相互碰撞使本来就稠密的地球云层变得越来越厚。
The amount of space junk orbiting earth has reached a 'tipping point' where continual collisions are thickening the already dense cloud shrouding the earth, a Nasa report has revealed.
据美国宇航局最近的评估结果显示，载人登陆火星的任务需要把质量大约是国际空间站的两倍的物资送入太空，即大约176万磅(800吨)。
By current NASA estimates, a crewed mission to Mars needs to lift about twice the mass of the International space Station into space? Roughly 1.76 million LBS. (800 metric tons) of technology.
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