i personally believe that all large celestial bodies keep growing over time unless they are smashed or merged into others
saturn and jupiter are examples of precursors to stars, the complexity and size of the magnetic fields of these planits is clearly a progression from our large planet, and the question of whether mars or venus were ever habitable, i think no, i think that mars and venus are in early stages of forming their magnetic fields
my hypothesis is based on the idea that space is a noisy mess of random particle formation, but at the centre of planets full of at extreme gravitational pressure, like in the centre of our planet, the largely iron core, which is at a supercritical state where it is solid, and it is liquid, and it is plasma at the same time... at a sufficient pressure, the compression of the iron/nickel/cobalt metal becomes so high that it becomes superconductive, once the mass reaches a certain threshold
once that superconductive compressed state emerges, it becomes permanent, and due to the relation between gravity, mass and time, the amount of time that these randomly forming particles that have been observed deep underground inside lead shielded vacuum chambers, where to us here on the surface they blink out in picoseconds or less, at the time flow speed in the core of the planet, they live for probably millions of years, the coherence of the ferromagnetic superconductive supercritical mass of the core, induces cohesion and particles that would have blinked in and then back out due to missing harmonics, are able to find them, and then blink into permanent existence as stable atoms, electrons, neutrons, all that... so...
what you get then is that after matter aggregates enough from the flow of gases and dust and particles and rocks and larger particles, eventually it accumulates, out of all the available nearby matter, to become large enough, and it then starts to experience the melting pressure of the gravity of the mass, the ferromagnetic materials start to chromatographically separate towards the core where they are the most stable at this level of pressure, and as it continues to grows, you get moons, and then the moons grow to become rock planets like ours,mars and venus, and then eventually they grow to become gas giants, and then gas giants, once they get big enough, not only continue to grow at a proportional rate of mass ath their core, they are experiencing centrifugal force of the high energy particles are thrown outwards and eventually form a stellar corona and so on and so forth
