Physics  weighing a planet
posted by Shaila .
Explain how you can weigh a planet?
( Is it by the combination of the netwons law of univeral gravitation and keplers third law; t^2/r^3 = 4(pi)^2/G(Msun) )

I assume you mean massing a planet, not weighing. Weight is the action between two masses due to gravity.
http://www.physics247.com/physicstutorial/massplanet.shtml
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