German astronomer Johannes Kepler (1571-1630) discovered in 1619 that the mean orbital radius of a planet, measured in astronomical units (AU), is equal to the time of one complete orbit around the sun, measured in years, raised to a power of 2/3.
a. Venus has an orbital time of 0.615. What is its radius?
b. Saturn has a radius of 9.542 AU. How long is its orbital time?
c. Complete this table.

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Mercury VErh Mars Planet Orbital radius (AU) Orbital time (yr) Mury V Earth Mars 0.387 1.523 0.615 1.00 Planet Orbital radius (AU) Orbital time (yr) Jupiter Stur Uranus Neptune 30.086 9.542 11.861 84.008