Don't read further if you are fond of sleeping:
What really sinks to the middle is the heavy metals, most notably uranium.
Yes, the core of our planet is a nuclear reactor.
And more uranium is sinking towards the core over time.
When enough arrives the core goes hypercritical and explodes.
Just like what happened to the planet between Mars and Jupiter.
Sweet dreams...
Re: “When enough Uranium arrives the core goes hypercritical and explodes.”
That’s extraordinary.
I had no idea.
What’s the ballpark percentage of rocky planets that will explode, before their dying sun gobbles them up, anyway.
I’ll guess that even some gaseous planets are susceptible to this.