How much space have you occupied in your lifetime?
Suppose there is a second dimension filled with very dense foam.
Everywhere you walk the foam disappears.
The foam is not disturbed by anything other then yourself (not your cloths nor your belongings).
Now when you die we check how much foam is gone in the other dimension.
What happens to the foam for an astronaut?
So we need to take the foam in the entire universe.
But if the foam is relative to earth it would not be correct for a
person traveling to the moon.
So we need to take the foam relative to our sun?
My idea was to put it relative to the center of all mass in the universe.
If you would hang still in that exact point you would not start to move
because all mass of all the stars and planets pulls at you from all sides
with exactly the same force.
How much volume is this?
We could try to determine an upper limit.
For instance take the surface of the earth for a height of 170cm.
That would probably be a nice upper limit don't you think?
I don't think so, cause we are on the earth and the earth moves with an approximated speed of
107km/h around the sun.
This means that each second our body moves 28 meters. Thats approximately: 28m x 1.8m² = 50.4m³
So at minimum we use up 50.4m³ of foam every second.
But the universe is expanding. This implies that this value will probably be a lot higher.
What would it look like?
We harden the foam, drill a hole and fill it with tin. Remove the foam, how does it look?
We rotate with the earth rotation, so that causes a circular stretched over 1 day around the sun.
We get 356 circles stretched over an other circle with radius the distance from earth to the sun.
The little circles with tilt back and forth on the pace of the seasons.
And all that stretched in the relative speed of our solar system to the relative center of the universe.
Calculating exact numbers is near impossible. The shape would resemble a stretched double spiral where the smallest spiral is tilting axes back and forth about 2 times over the big spring period.