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Asked Feb 28, 2019
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The orbit of Comet UX209 about the Sun is not a circle but it orbits once every 365 days, just as Earth does. UX209 is closer to the Sun in April than it is in October. Thus, the speed of UX209 as it moves along its orbit is 

 

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Orbital bodies sweep a constant volume per unit time. Hence, speed of a planet ...

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