Halley's comet has an orbital period of 74 earth years. Kepler's third law can be used to
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Halley's comet has an orbital period of 74 earth years. Kepler's third law can be used to predict its orbital radius. What is its orbital radius in astronomical units? (one astronomical unit is equivalent to the distance between the Earth and the sun. In other words, it is the earths orbital radius.)
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