In the elliptical orbit of Comet Halley shown in Fig.
Chapter 13, Problem 20DQ(choose chapter or problem)
In the elliptical orbit of Comet Halley shown in Fig. 13.20a, the sun’s gravity is responsible for making the comet fall inward from aphelion to perihelion. But what is responsible for making the comet move from perihelion back outward to aphelion?
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