Mass ~ matter
Matter is formed by "E" energy and "µ" the gravitational energy.
E and µ are the result of the action on each other of "light and gravity" C^2 and G.
such as infinite / infinite = 1 , where 1 is the bounded result of the action of 2 unbounded quantities.
Thus matter is the bounded result of two infinities " light and gravitation" .
For our earth
Two formulas . E = M * C^2 = 5.36753345E+35
µ = M * G = 3.9860044E+14
together they form matter
E and µ relate like C^2 and G
E / µ = 1.34659495E+21 matter . if this ratio changes matter no longer belongs in our system.
C^2 / G = 1.34659495E+21
So the matter will always be in a place where their ratio is right C^2 / G
For our system (Earth) the matter must be in the system where the speed of light
= E(earth) / M (earth) = 5.3675335E+35 / 5.972186E+24 = 8.98755E+10 = 299792.458 km/s
The gravitational acceleration µ is also used to calculate the fall velocity, which decreases with distance ^2
For the earth the radius r = 6378.1366 km
Falling acceleration = 9.7982867 m/s
See example