[quote author=Fu-Kwun Hwang link=topic=2365.msg8844#msg8844 date=1324829323]
Do you mean the mass of the planet instead of weight of the planet?
[/quote]

Yes of course.
Sorry but each time I used "weight", I meant "mass".


[quote author=Fu-Kwun Hwang link=topic=2365.msg8844#msg8844 date=1324829323]
The mass of the planet is proportional to volume of the planet. M=\rho \frac{4\pi r^3}{3}
[/quote]

In a way yes. But it depends on density.