Question: Halleys Comet has an elliptical orbit with a = 17.94 AU (AU is astronomical unit, 1AU = 9.3 10 7 mi ) and b

Halley’s Comet has an elliptical orbit with a = 17.94 AU (AU is astronomical unit, 1AU = 9.3 × 107mi ) and b = 4.552 AU, with the sun at one focus. What is the closest that the comet comes to the sun? Explain your method.

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