Subject
The interior of a planetary body is unknown unless either; a) sufficient core drillings are carried out (impossible with today’s technology) or; b) estimate its interior construction from its polar moment inertia .
A planet’s polar motion of inertia can be established with highlevel of accuracy using Isaac Newton’s laws of motion and planetary spin theory ; once known it is possible, using core pressure theory to estimate the densities of the various known layers within the planetary body.
In addition, once the various layers of the planetary body are known, Newton’s laws of motion may be used to calculate the pressure anywhere within the body. As can be seen in the above figure, the earth’s core pressure is over 1.35E+07 bar.
The purpose of the Core Pressure calculator is to provide an estimation facility for the internal structure of a planetary body from its mass and its polar moment of inertia.
You enter various internal pressureplane radii and associated densities (up to six) of the body and iterate the values until you can match the calculated mass (known from Newton’s laws of motion) and polar motion of inertia (known from spin theory) with the actual mass and actual polar motion of inertia.
For help using this calculator, see Technical Help
Core Pressure Theory  Options
Core Pressure Theory
Cores is a calculation facility for the internal structure of a planetary body.
You enter: 
and the Core Pressure calculator will provide: 


Mass factor

Polar moment of inertia factor

Layer interface pressure (0 to 6)

Check minimum system requirements