行星地球面对面危险近在咫尺？_BEC初级作文

行星地球面对面危险近在咫尺？

A mountain-sized asteroid which crosses paths with the Earth every three years has been discovered by a Russian scientist.

近日，一名俄罗斯科学家发现了一颗山峰大小的小行星每三年都会经过地球的运行轨道。

Vladimir Lipunov, a professor at Moscow State University, said the space rock, named '2017 UR116', poses no immediate threat.

莫斯科国立大学（Moscow State University）教授弗拉基米尔（Vladimir Lipunov）表示，这颗名为“2017 UR116”的太空岩石目前对地球并未造成直接威胁。

But he warned that it could hit the Earth with an explosion 1,000 times greater than the surprise 2013 impact of a bus-sized meteor inRussia. That object entered Earth’s atmosphere over the city ofChelyabinsk, resulting in a series of ferocious blasts that blew out windows and damaged buildings for miles around.

但是，如果这颗小行星撞击地球，其产生的爆炸强度将会是2013年袭击俄罗斯的那颗公交车般大小的流星的1000倍。那颗流星穿越地球大气层，在车里雅宾斯克（Chelyabinsk）上空爆炸，火花四溅，击破了窗户，损坏了方圆数英里内的建筑。

Prof Lipunov said it is difficult to calculate the orbit of big rocks like '2017 UR116' because their trajectories are constantly being changed by the gravitational pull of other planets