Quote:
Originally Posted by Pazuzu
Space was not moving INTO anything. The anything ITSELF was what was expanding. It wasn't a case of an existing region, and the Universe was just taking up a larger section of it. There was no region, all of "region" was bundled up into the thing that was expanding. So, therefore, there is nothing "outside" of space, there was no pre-existing "thing" that space moved into, and no need for a prime mover.  wink back at you.
As for faster than light, things cannot move faster than light though spacetime. Spacetime ITSELF has no such restrictions. The only problem with spacetime expansion is that information is lost when two sections of spacetime expand away faster than the speed of light...there was no communication across the Universe when Inflation happened. This was part of the decoupling, and why we cannot talk about what is beyond the Visible edge to the Universe. There's stuff out there, but any information has been lost between it and us, since spacetime stretched faster than light between it and us. |
I thought we just discovered that gravity waves also move at speed of light - which is just space moving right?
I played this through in my head a few times and don't see why expansion had to be faster than C. Do you happen to have a thought experiment handy that explains why its necessary that expansion happened at more than c?