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Fictitious Planet Details. Answered

         For a personal project of mine, I am creating a fictitious solar system with planets that can sustain life.  To make the project more realistic, I have a set of rules. Mainly, the planet and its inhabitants have to able to exist. I really want a unique planet, and I have it all figured out, except for one thing. The core. So, my question is this:

          Could a planet have a gaseous core, and have it very dense and hot, much like a little star, as well as a solid outside?

If so, how could it have formed?  



Best Answer 6 years ago

A large ice core gets impacted and compacted with a rocky crust  from a crackup of  two planetoids to form a true large mars sized planet.

Then the brewing center of the rocky system  accumulates additional mass to light off a nuclear star fire.  
The star penumbrat engulfs the ice core planet long enough to turn the ice core to steam which escapes leaving it mostly water vapor gas core in the rocky crust.

Over time the sun has a stability issue and ejects a substantial plasmid mass into space causing a reduction of thermal energy to the planet and adds spin to the star.

Now you have a mars sized planet within a thermal water zone of a sun and a hot gas core.  Probably won't last for eons.


You're thinking of Jupiter.

Even Jupiter has a solid core.

I know there's a presumption of a solid core (I remember Clarke's description of a diamond rain), but has it actually been detected?

What is solid ?  You can stand on ice but a string can pass through a block of ice by pressure tension force.
Simple math suggests Jupiter's center is compressed enough to briefly support our skeletons and maybe metal.
We could crawl on Hg but that is a liquid or is it on earth's poles.
Is density or structure (both impenetrable by us) define a solid ? ?

Still liking my conceptual formation of a gas core planet.


If you can create your fictitious universe then you can dabble in the physics also.

So, how about a planet that has a tiny core that creates negative gravity and repels rather than attract.  So the core sits in the middle of a solid sphere of crust and the atmosphere is between the crust and the core.  So the people walk on the inside of the planet.  And if they look up they are looking at the other side of their world.  Like if you turned the earth inside out.

Unlikely. The problem is the contact interface between the "hot, dense gas" (or plasma?) and the presumably solid mantle. Unless your planet is constructed (i.e., not naturally formed) out of a refractory ceramic, the plasma core will ablate the mantle from the inside outward.