In popular science (SciPop) the mass of the Earth is calculated by knowing: its radius, the gravitational constant big G, little g, the field value for acceleration due to gravity.
Here's the table of planetary mass values in the Geocentrospheric cosmological model.
We can convert heliocentric planetary mass values to Geocentrospheric using Matty's Constant, 9.87^-12, for the conversion of fantasy into reality.
The distance to the firmament (heaven), from the center of the Earth, is approx. 1,736,441 light years. But we (that's me and the Holy spirit) would appreciate it if someone would check our math.
The mass of the Earth has never been directly measured. It's calculated using the radius of the Earth, the value of g we get from a ball drop experiment (acceleration due to gravity), and the gravitational constant, G.
It appears from the amount of subduction and upthrust around the world that the Earth's circumference has changed. It's an arcane phenomenon called circumferential shortening.
We have developed a 3D spherical hollow Earth model (SHEM). If the Earth has experienced radial shrinkage and it's diameter decreased, we can so some simple calculations to figure out what the original radius was.
It will help to have an idea of the volume of material in the Earth's mantle because it appears that Earth has shrunk since it was first created, a process known as radial shrinkage.
The popular science "liquid outer core" is speculative at best, and there is no reason why it can't be open space. The P-wave shadow zone is the great gulf of which Jesus spoke in Luke 16:26.
"Is Hell exothermic (gives off heat) or endothermic (absorbs heat)? Support your answer with a proof." - University of Washington exam question.