Re: Even if we could get there, somehow
Seven times the mass, but 1.4 times larger. So a surface gravity 7/(1.4^2) = about 3.5 times ours. Still something where you'd want to put arch supports in your shoes.
But also a density 7/(1.4^3) = about 2.5 times ours, or a bit over 12.5 gm/cc. Iron comes in at 7.87, lead at 11.36. I haven't read the Fine Paper to see what error bars they give, but I'll take a guess that the planet is a little bigger and a little lighter than the given values, enough so to bring that density to a more reasonable value. Either that, or it has a core made of mercury (13.55) or gold (19.32) or uranium or something similarly exciting.