ZZZZZzzaaaapppp!The Solar System (now around 7-8 billion years ago) consists of a binary set of stars - Spider (a pulsar) and Rabbit (a white dwarf) in the middle of a giant "dust cloud" (Planetary nebula). This is the same dust cloud that the current/original Solar System Genesis theory starts with.
|The Ant Nebula|
A white dwarf star like Rabbit spends its time sucking up gas/dust and growing bigger. Once it gets to a certain size (~1.4 Suns) it will blow up in a spectacular supernova. But in this case, the binary stars are BOTH sucking up gas/dust. Spider is a pulsar, and it "pulses" with gamma rays, x-rays, whatever rays - and not to mention it's (one of) the strongest magnets in the Universe. Poor Rabbit is exposed to these "blasts".
|Pulsar hitting companion star|
Not to mention the rest of the dust cloud gets blasted also (although most pulsars blast perpendicular ...).
So the analogy here is a starving man with abundant food around him. He grabs some food and starts eating. Eventually that guy behind him slaps him on the back and he spits out the food. The white dwarf Rabbit is sucking in gas/dust, trying to get big enough to supernova - but the pulsar (Spider) blasts him - and all of the gas/dust shoots back into the cloud.
White dwarf stars grow bigger by taking in gas/dust/particles and fusing them (Nuclear Fusion) through its tremendous gravity. The longer the gravity can work on the material - the denser it can become. So depending on when Rabbit gets blasted, that determines what kind of material gets shot back out into the cloud.
So now let's run through the "standard" existing Solar System (dust cloud) model. The dust cloud slowly collapses and begins spinning (faster and faster). Planetesimals (small planet pieces) "accrete" (stick together and grow bigger and bigger) and eventually form into the original 4 planets (as the cloud dissipates). The lighter density planets (Gas Giants) Jupiter and Saturn are formed further out, and the higher density (rocky) planets form closer to the center. But because of the (Nova-induced) "enriching" - the rocky planets gain lighter density material (Venus and Earth get atmospheres, water, Lithium ...etc.).
The timeline is now 4.6 Billion years ago. The Sun is just now beginning to shine . . .