这取决于几个因素，包括（从地球附近经过的运动轨迹类似于彗星的太阳系第十二行星所携带的）红色尘埃用多少时间穿越地球大气层沉淀到它被第一次近距离观察并报告的地方。
This depends upon a number of factors, including how well the dust drops through the atmosphere to be deposited on land where the very first evidence will be closely watched for and thus observed.
靠着他近乎神圣的智力，行星的运动和轮廓，彗星的轨道，大海的潮汐第一次得到了论证。
Who, by vigor of mind almost divine, the motion and figure of the plants, the paths of comets, and the tides of the seas first demonstrated. the epitaph of Sir I.
彗星的准确轨道运动的确定是个复杂而困难的问题，其显著特点是存在非引力效应。
Cometary accurate orbital motion is a complex and difficult problem. Its remarkable characteristic is the presence of the non-gravitational effect.
这个屏幕保护显示真实的行星，闪烁的星和运动的彗星的太空场景。
Software Description: About Spacefun, This saver displays a space scene with animated planets, twinkling stars and a moving comet.
这个屏幕保护显示真实的行星，闪烁的星和运动的彗星的太空场景。
Software Description: About Spacefun, This saver displays a space scene with animated planets, twinkling stars and a moving comet.
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