This system supports the edit of earth object, the display and storage of flight map data.

系统具备地物对象的编辑、航空地图数据的显示和存取等功能。

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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 list has been compiled by researchers from the University of Southampton using software called called NEOimpactor, short for NASA's ‘NEO’ or Near Earth Object programme.

这份名单是由来自难开普敦的研究学者们利用一项名为NEOimpactor的软体所测算出来的，NEO是美国宇航局近地面项目的英文缩写。

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But others note that Jupiter's powerful gravitational field can just as easily send an object into Earth's path as push it deeper into space.

VOA: special.2009.08.25

But gravity has a remarkable property that the pull of the Earth is itself proportional to the inertia of the object.

重力有一个显著特征,即地球的引力,与物体的质量成比例

耶鲁公开课 - 基础物理课程节选

It's not talking about the gravitational pull of the Earth on an object.

没提到地球对物体的引力

耶鲁公开课 - 基础物理课程节选

This flyby will provide a unique opportunity for researchers to study a near-Earth object up close.

ENGADGET: PSA: Asteroid 2012 DA14 will pass the Earth at 2:00pm ET Alt

This asteroid, like the one that will fly by on February 15, is considered a near-Earth object.

CNN: So, about that asteroid near Earth ...

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

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