A comet moves in an elliptical orbit around a star. When it is closest to the star at a distance of 7.75 ✕ 1010 m, the comet's speed is 70.0 km/s. How far is it from the star when its speed is 66.0 km/s? Take the mass of the star to be 1.99 ✕ 1030 kg, the same as that of our Sun.

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