as the subheading of this article sayd..."my brain hurts."
Infinities can be of different sizes, but maybe that only has to do with math...
Can You Count Past Infinity?
Always a fun topic, and one that I've contemplated in the past.
The first point to make is that 'infinity' is simply from the Latin meaning 'unbounded'. So (starting with countable infinities, the elements of the number line) you can define a googolplex, raise any number x to the googolplexth power, and raise the result to the googolplexth power, repeating a googolplex of times. Since the number line is unbounded, the only problem about doing this is notation.
The second point to make is that in examining the physical universe we don't find examples infinities. (Some of the maths models may result in 1/0 or whatever, but no one can point you to an out-there example.) But we indeed have minimum quantities ─ the Planck length, the Planck cube, the Planck time ─ below which, we say, no meaning can be attached to the result. To compare this to the possible infinities of the mathematical imagination, consider (and if you like, check for yourself) this simple sum about reality:
The Planck length is ~ 1.616252 ... e-35 meters.
A Planck cube is a cube the length of each side being 1 Planck length.
There are ~2.368e+110 Planck cubes in a cubic meter.
Now, let's stay with the working assumption that the universe is spherical.
A light year is 9.46 x 10^15 m.
Wikipedia tells me the radius of the universe is 4.7 e+10 light years.
So the volume of the universe is 4.35 e+32 cubic light years.
There are 8.47 e+47 cubic meters in a cubic light year.
There are 2.37 e+110 Planck cubes in a cubic meter.
PUNCHLINE
The volume of the universe (on the basis above, anyway) is, call it, 8.73 e+190 Planck cubes, the smallest possible meaningful unit of real volume.
That's a lot of Planck cubes, but nothing like an infinite number.
Again, using that radius of the universe above, the circumference is
The third point is that there's no coherent concept of ω in reality. The idea that 'infinity' is a point and that therefore there can be a 'lowest transfinite ordinal ω' is fine in the realms of imagination but it doesn't intersect with the real world anywhere.
So being a simple soul, I try to avoid the word 'infinity' because it's accumulated so many woo associations (Cantor hungered for woo in his work) and think of 'boundlessness' instead.