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I need an equation to help me find the mass of a planet.

Currently, I have a gravitational constant but not much past that.

I need this so I can find the radius of the planet, using g=m/r(r)

If anyone has any ideas or help, it would be greatly appreciated!

Google tells me it's dependent on the mass of the sun. A planets mass will also vary by size and composition; maybe this site will help?

Thanks! I think this is what I'm looking for.