Lindley Johnson, head of the near-Earth object program at NASA headquarters in Washington, D.C., says an asteroid the size of a football field could wipe out a major city.

在华盛顿的美国宇航局总部的近地天体计划负责人林德利-约翰逊说，如果一颗足球场大小的小行星撞上了地球，其威力可以毁灭一座大型城市。

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The Near-Earth Object Observation Program, commonly called "Spaceguard, " also plots the orbits of these objects to determine if any could be potentially hazardous to our planet.

近地天体观察项目，常被叫做“太空警卫”，也对这些天体绘制了轨道图来判断其中是否有天体可能对我们的星球有潜在危险。

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"We are extremely confident, 100% confident, that this is not a threat," said Don Yeomans, manager of NASA's Near Earth Object Observations program, which makes it its business to know these things.

“我们极其自信，有100%的信心，这不会造成威胁，”姚曼斯博士说，他是NASA近地球物体观测项目的经理，了解这些是他必做工作。

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"No Earth impact is possible, " according to Don Yeomans, manager of the Near-Earth Object Program Office at NASA's Jet Propulsion Laboratory.

CNN: Russian meteor shower causes blast; hundreds injured

"The meteor was probably about the size of an SUV, " said Donald Yeomans, manager of NASA's Near-Earth Object Program Office at the laboratory, in Pasadena, Calif.

WSJ: Meteor Creates a Show, No Apparent Damage

"We would expect an event of this magnitude to occur once every 100 years, " said Paul Chodas of NASA's Near-Earth Object Program Office, in a statement.

WSJ: Russia Meteor Was Largest in More Than a Century