Universe expanding +c. +c impossible?

AI Thread Summary
The discussion centers on the concept of the universe's expansion and its relationship with the speed of light (C). It clarifies that while transmitting information or objects faster than C is prohibited, the expansion of space itself can occur at rates exceeding C. This means that galaxies can move away from each other faster than light due to the increasing distances in the expanding universe. The analogy of a balloon illustrates this phenomenon, where points on the surface represent galaxies moving apart as the balloon inflates. Ultimately, the expansion of the universe allows for distances to increase without violating the laws of physics regarding the speed of information transfer.
budd
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can anybody explain this to joe public?
 
Space news on Phys.org
Transmitting information (or moving a physical object - same thing) from place to place faster than C is banned. Moving the two places apart faster than C is allowed
 
or, to think of it in a mind warping way (no pun intended)... When the universe expands, it's not that things are flying apart from each other, it's that the distances between everything are getting bigger.
 
so on this balloon thingy. if we start of with 2 galastic clusters next to each other but movin g away at +c how do we see them?
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
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Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
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