有一些还未被美国宇航局近地天体计划发现的小行星，很有可能会撞击我们的地球，一个被称为1950 DA的现象很有可能在2880年出现。

None of the objects yet discovered by NASA's Near earth objects program have a high probability of hitting the earth — though one known as 1950 DA will come extremely close in 2880.

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即使每年都有几颗类似体积的小行星飞临地球，近地天体项目的望远镜也时常观测不到，因为巡天望远镜是为寻找较大，较远的太空岩石。

Even though asteroids of roughly that size fall to Earth a few times a year, the NEO Program telescopes often miss them because the survey is tuned to search for larger, more distant rocks.

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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。

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.

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