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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Does NASA have an estimate of the probability that the Earth will be hit by a potentially hazardous object (such as an asteroid) in the next 100 years?

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The US space agency's (Nasa) Near Earth Object programme reports on its website that it has recorded 1068 known "Potentially Hazardous Asteroids", however there are thousands more estimated to be present in space.

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