Option	Symbol	Measurement units	Model S	Model V
The radius of the Earth now of its formation	$R_{0}$	km	4315	4459
Constant rate of destruction of earth’s core substance	$k_{V}$ , $k_{s}$	billion years⁻¹	0.04282	0.1645
The possible lifespan of the Earth’s core	$t_{e n d}$	billion years	23.4	∞
Earth’s core half-life	$t_{0.5}$	billion years	11.68	4.21
The rate at which the Earth’s core is reduced in the initial period	$v_{0}$	km∙billion years⁻¹	185	733
The relative total thickness of the Earth’s crust and mantle is now	${\hat{H}}_{C C} (t_{P})$	-	0.804	0.778
The earth’s relative radius now	${\hat{R}}_{E} (t_{P})$	-	1.577	1.511
The relative speed of the Earth’s expansion is now	$\frac{d {\hat{R}}_{E} (t_{P})}{d t}$	billion years⁻¹	0.0593	0.0424
The rate at which the Earth’s crust expands near the equator		mm∙year⁻¹	1.51	1.12
The specific rate of expansion of the Earth’s crust near the equator		nm∙year⁻¹∙km⁻¹	37.6	28.1