Posted by Anonymous on Monday, March 29, 2010 at 5:16am.
For all planets orbiting the sun, or another star of the same mass as the sun,
P^2*/R^3 = constant
P is the period and R is the radial distance.
This is called called Kepler's third law. http://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion#Third_law
Since R^3 is 64 times larger for the other star's planet (in your problem), P^2 must be 64 times larger also. The Period ratio is the square root of 64.
is 8 the correct answer
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