Juno has arrived at Jupiter, and will begin taking measurements to determine if the gas giant has a solid core. But what I cannot seem to find is the implications such a discovery would have. This paper says that there are essentially two models - the Core Accretion model and the Disk Instability model.
Core Accretion follows the idea that gas giants start off as rocky bodies which quickly accrete mass and gas, eventually leading to runaway growth and forming gas giants. This model may take from one to a few Myr, and requires a fair amount of rocky material in the protoplanetary disk.
The Disk Instability model says that gas giants form in a similar manner to stars; collapsing in from clouds of gas. In this instance, no central core is needed to begin accretion. This happens at a much faster rate, and these gas giants can still produce cores via sedimentation.
My questions are thus:
- If Juno discovers a solid core on Jupiter, will that allow us to pick one of the two models, since both could evolve a solid core?
- If we discover that Jupiter does or does not have a solid core, what does that mean for the development of Earth and life?
I've looked around, but haven't been able to find a source that links the two very neatly.