彗星向来让人类着迷。几个世纪前吸引人的,是它们划过天际时的发光尾巴;如今更令人着迷的则是彗星给地球带来生命的“种子”这一可能性。最著名的彗星作为一名中学生,你肯定不会再像我们的先辈们那样,把彗星看作是不吉祥的“扫帚星”了。如果有人问你最熟悉哪颗彗星,想必你会脱口而出:“哈雷”彗星。这颗由英国天文学家哈雷在1705年首先测定其运行轨道,并准确预言它将于1758年回归的彗星,确实曾引起地球人极大的 Comets have always fascinated humans. What fascinated centuries ago was the glow of their tail as they crossed the sky; what is even more fascinating today is the possibility that comets bring “life-span” seeds to the earth. The most famous comet As a middle school student, you certainly will not see the comet as the unlucky “broom star” like our predecessors did. If anyone asks you which star is most familiar to you, you must have blurted out: “Halley” comet. This piece, originally measured by the British astronomer Harley in 1705, orbit and accurately predicting the comet that it will return in 1758, did indeed cause great Earthwomen