The way we measure distance in space is in Astronomical Units (AU's) within relation to the sun. ... Kepler's Third Law: The ratio of the cube of the semimajor axis of a planet's orbit to the square of its orbital period around the Sun is the same for each planet. ... If a is measured is astronomical units, T is measured in years (so that is measured in y-1, and the central mass is the sun (so that , i.e., the solar mass), then Kepler's law takes the extremely simple form (http://scienceworld.wolfram.com/physics/KeplersThirdLaw.html) (http://javalab.uorego...

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