Only thing that might be off is the radius there, as it'll vary based on the phase that each planet is in it's orbit, which will make it go even lower at points

Only thing that might be off is the radius there, as it'll vary based on the phase that each planet is in it's orbit, which will make it go even lower at points. Also WFA will do the units too, http://www.wolframalpha.com/input/?i=G+*+6e24+kg+*+6e23kg+%2F+(7e19m)%5E2 http://www.wolframalpha.com/input/?i=G+*+6e24+kg+*+6e23kg+%2...