对那些以科学思考的人来说，他们会猜想这明星是否是一颗彗星，也许是哈雷慧星吧；
For the scientifically-minded , they wonder whether the star was a comet , perhaps Halley 's comet ;
土温出生于1835年，正巧赶上75年回归一次的哈雷慧星划过长空。
Twain was born in 1835 following the appearance of Halley 's Comet , which comes about once every 75 years .
哈雷慧星