Kepler's third law, P2 = kA3, shows the relationship between a planet's orbital period (P) and the length of its semi-major axis (A). Which statement is true about Kepler's law?
A. The orbital period is measured in units of time, and the semi-major axis is measured in units of mass.
B. The value k is constant for each of the eight planets in our solar system.
C. For a body orbiting the Sun, increasing the orbital period increases the length of the semi-major axis.
D. To calculate the value of k for a planet in our solar system, find A3 : P2 for the planet.
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