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Biology 12 Online
OpenStudy (anonymous):

Halley's Comet has an extremely elliptical orbit around the Sun, with an eccentricity of 0.967. Its average orbital radius is 17.8 AU, and it was last observed in 1986. Use Kepler’s Third Law to calculate when Halley's Comet will appear next. (Note: The answer you obtain is based on averaged data and is an approximation.)

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