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Unformatted text preview: For the orbital periods use the absolute value in days and for the semi-ma jor axes leave the distances in kilometers. (Negative periods imply retrograde motion.) The graph can be computer generated or hand-written on graph paper. Compare with the graph in the Lecture Tutorials, p. 26. Do the natural satellites of Saturn obey Kepler's third law? Explain. Keplers 3 rd law states that, the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. As you can see from the following graph, the moons of Saturn do indeed follow Keplers 3 rd Law. In the graph, the x-axis represents the semi-major axis in km and the y axis represents the orbital period in days. The graph is a scatter plot connected by a line that appears to gradually increase at a steady rate....
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- Spring '11