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please help me to solve this two problem and explain, thanks a lot!

13.21 (a) The orbit of Comet Halley. (b) Comet Halley as it appeared in 1986. At the heart of the comet is an icy body, called the nucleus, that is about 10 km across. When the comets orbit carries it close to the sun, the heat of sunlight causes the nucleus to partially evaporate. The evaporated material forms the tail, which can be tens of millions of kilometers long. Planetary orbits; Pluto Neptune Uranus Saturn Jupiter 1977 1983 Mars 1948 2024 Orbit of Comet Halley Earth 1996 1989 1987

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