近地太空中的小行星和彗星们持续威胁着我们的星球。
Asteroids and comets in nearby space pose a constant threat to our planet.
天文学家通过在太空中反射光的方式将小行星分门别类。
Astronomers group asteroids into different classes based on how the rocks reflect light in space.
尽管我们可以相当精确地计算出地球对这些小行星运行轨迹的影响，但是太空中别的天体的运行机制对这些石块的作用却很难评估。
Although gravitational influences on the asteroid's trajectory can be fairly accurately calculated, other mechanisms acting on the rock are not so easily modeled.
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