2.地球的公转轨道接近圆,但彗星的运动轨道是一个非常扁的椭圆.天文学家哈雷曾经在1682年跟踪2.地球的公转轨道接近圆，但彗星的运动轨道是一个非常扁的椭圆。天文学家哈雷曾经在1682年

2.地球的公转轨道接近圆,但彗星的运动轨道是一个非常扁的椭圆.天文学家哈雷曾经在1682年跟踪2.地球的公转轨道接近圆，但彗星的运动轨道是一个非常扁的椭圆。天文学家哈雷曾经在1682年
2.地球的公转轨道接近圆,但彗星的运动轨道是一个非常扁的椭圆.天文学家哈雷曾经在1682年跟踪
2.地球的公转轨道接近圆，但彗星的运动轨道是一个非常扁的椭圆。天文学家哈雷曾经在1682年跟踪过一颗彗星，他算出这颗彗星轨道的半长轴约等于地球公转半径的18倍(如图所示)，并预言这颗彗星将每隔一定时间就会出现。哈雷的预言得到证实，该彗星被命名为哈雷彗星。哈雷彗星最近出现的时间是1986年，请你根据开普勒行星运动第三定律估算，它下次飞近地球是哪一年？

2.地球的公转轨道接近圆,但彗星的运动轨道是一个非常扁的椭圆.天文学家哈雷曾经在1682年跟踪2.地球的公转轨道接近圆，但彗星的运动轨道是一个非常扁的椭圆。天文学家哈雷曾经在1682年
你说的题目是这个吗?
地球的公转轨道接近圆,但彗星的运动轨道是一个非常扁的椭圆.天文学家哈雷曾经在1682年跟踪过一颗彗星,他算出这颗彗星轨道的半长轴约等于地球公转半径的18倍,并预言这颗彗星将每个一定时间就会出现.哈雷的语言得到证实,该彗星被命名为哈雷彗星.哈雷彗星最近你出现的时间是1986年,请你根据开普勒行星运动第三定律估算,它下次飞近地球将是
A．1987年 B．2004年
C．2062年 D．2040年
如果是这个题那应该选C.
根据开普勒第三定律：各个行星绕太阳公转周期的平方和它们的椭圆轨道的半长轴的立方成正比.地球的公转周期为一年,因此可算出常数k为1除以地球公转半径的立方,再代入开普勒第三定律,可得哈雷彗星的公转周期约为76年,所以在2062年时能再次看到该彗星.

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