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人教版新教材《物理》必修2第36页有如下一道课后练习:地球的公转轨道接近圆,但彗星的轨道则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(见图1),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,它下次飞近地球将在哪一年?
PEP: The Physics Compulsory 2 Page 36 There is an afterthought that follows: Earth’s orbit is close to a circle, but the comet’s orbit is a very flat ellipse. Astronomer Harley had tracked one in 1682 Comet, he calculated that the semimajor axis of the comet orbit is about 18 times the radius of the earth’s revolution (see Figure 1) and predicts that the comet will appear at regular intervals, and Halley’s prediction confirms that the comet was named For Halley’s comet Halley’s comet recently appeared in 1986, is it possible to estimate from Kepler’s third law of planetary motion the next year it will fly near the Earth?