Originally posted by twhitehead
I am sure we have discussed this before. Speed is relative between two points. You cannot put a 'speed' figure on expansion. To say 'space is expanding faster than c' is incoherent. Currently the expansion of space is:
[quote]74.3 plus or minus 2.1 kilometers (46.2 plus or minus 1.3 miles) per second per megaparsec (a megaparsec is roughly 3 million ligh ...[text shortened]... er a distance of one nanometre will exceed c. At that point molecules start to get ripped apart.
Of course that is assuming the present accelerated expansion will continue unabated.
Right now we don't know what is causing the acceleration so there could also be some kind of correction a billion or 10 billion years from now.
Anyway, it is no cause for panic since not only will humans be extinct but our entire solar system will be extinct🙂
Here is my pet theory of the acceleration:
Our universe in some multi-dimensional way is surrounded by sister universes like foam where one bubble (our universe) is totally surrounded by other bubble universes.
So the mass of all those bubble universes will tend to pull at our universe gravitationally, normal gravitation, no need for any esoteric physics in that case.
So in that scenario, our universe may be destined to just blob up together with another bunch of universes like how foam in water tends to combine into larger bubbles and that could go on for quadrillions of trillions of years and we may never even notice the transitions.
You heard it first here.
And maybe last🙂