From wikipedia:
The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time.[1] It is an intrinsic expansion whereby the scale of space itself changes. The universe does not expand "into" anything and does not require space to exist "outside" it. Technically, neither space nor objects in space move. Instead it is the metric (which governs the size and geometry of spacetime itself) that changes in scale.
As you can see from the quote above, we are living in this mathematical space.
Once upon a time there was this mathematical explosion (the Big Bang is not a real explosion). Since then, space
mathematically expands. Items in space like galaxies and other observable matter do not expand, just the "space". In this way, even if they say that a galaxy is moving away from us faster than the speed of light, no math made rules are broken, because: "that is not movement, it's expansion"...
Cool.
The expansion of the universe causes distant galaxies to recede from us faster than the speed of light, if proper distance and cosmological time are used to calculate the speeds of these galaxies. However, in general relativity, velocity is a local notion, so velocity calculated using comoving coordinates does not have any simple relation to velocity calculated locally.[25] (See Comoving and proper distances for a discussion of different notions of 'velocity' in cosmology.) Rules that apply to relative velocities in special relativity, such as the rule that relative velocities cannot increase past the speed of light, do not apply to relative velocities in comoving coordinates, which are often described in terms of the "expansion of space" between galaxies.
https://en.wikipedia.org/wiki/Faster-th ... _expansion
About the math made rules I mentioned: relativity says nothing can move faster than light. There was something about "infinite mass". Well, not really:
It is not good to introduce the concept of the mass of a moving body for which no clear definition can be given. It is better to introduce no other mass concept than the ’rest mass’ m. Instead of introducing M it is better to mention the expression for the momentum and energy of a body in motion.
— Albert Einstein in letter to Lincoln Barnett, 19 June 1948 (quote from L.B. Okun (1989), p. 42[5])
https://en.wikipedia.org/wiki/Mass_in_s ... tic_mass_2
2 objects in deep space, moving towards each other. No object has acceleration. Each object thinks in fact that it's standing still. Speed is distance/time. If this distance/time is calculated, from the point of view of either object it exceeds c. They pass each other. Nothing happens.
Physics is to mathematics what sex is to masturbation.
https://en.wikiquote.org/wiki/Richard_Feynman
Yes, this post is jut me venting off, "beating a dead horse".
