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58.
The data table below gives the mean radius of orbit (R) and the period (T) of planets orbiting the Sun.  What ratio is constant for these planets?
    
Planet Mean Radius of Orbit (R)
(x 10 6 kilometers)		 Orbital Period (T) days
Mercury 58 88
Venus 108 225
Earth 150. 365
Mars 228 687
A. R
---
T
    		C. R2
-----
T2 
B. R2
----
T		 D. R3
----
T2 
       
Kepler's third law is

   
   T1            r1
(------)2 = (------)3     The Correct Answer is D.
   T2             r2