Mercury as well the other planets in the solar system was born from the Sun because all planets centripetal acceleration fulfills the rule: g=(V.C)/R ln(1+V/C) where R – is the distance between the planet and the Sun, V=w.R where w – is the angular velocity of the equatorial area of the Sun. See USM part I www.kanevuniverse.com Obtained result coincides with the same acceleration estimated by the law: g=G.M/r^2 Second important suggestion is that the Sun in fact synthesis all nature element until uranium, but not only iron how was estimated so far. It is so because of the essence of the field, see again Part I USM. So the core of the Sun is contains from super dense and therefore with huge gravitational attraction material - nuclear chain, most probably from uranium nuclei, see joromachine www.kanevuniverse.com and with super strong common magnetic moment. That is why the Sun changes its magnetic poles for about 11 years or so – because of the interaction between this core and the plasma surrounding it. How it is seen this core reminds the so called “neutron star”, which of course hasn’t any physical means because such creation is impossible, as well this is in force about the so called “black hole”. Such core possesses any star, even any planet but the difference is only in the size of the core – in smallest objects this core can be only centimeter’s radius (see again USM and essence of the field). The size of the core of our Sun is around 70 km in radius (see USM). For example proof about this assertion we can find out in rings and moons of Saturn, in their different direction of revolving (some of them), which shows that the core of Saturn also changes its polarization, similarly to the Sun, but very slowly, because the Saturn is far smaller and far cooler than the Sun. Now we can suppose that Mercury (because it was born from the Sun last in line) has most large quantity of heaviest elements in comparison with the rest of the planets and that is why Mercury is most dense object in the solar system. Maybe the core of Mercury is responsible for volcanic activity there and maybe it is in force about all planets?! G.Kanev

From the comment section because I have nothing to say about this, it's a level of science I don't understand.