Quote:
Originally Posted by bartman
Sorry if this adds any confusion Brian, but Carl, if I am on the surface of the balloon ( attached) when it is inflated and look toward the inside, left, right, up and down -
|
Bart, the balloon analogy is valid for 2D space - the surface only. It would be very hard to imagine 4-dimensional balloon expanding in 4th dimension (much better presentation of the expanding Universe) so we are forced to go one dimension lower, to make things simpler or easier to visualise.
So, for your world (as a being on the 2D balloon surface) the "inside " of balloon doesn't exist.. or it is higher, un-observable dimension.
The inflation of the balloon by air pumped inside (do not confuse this with inflation of the Universe) means the balloon surface is increasing and the distances between the points on the balloon surface are therefore increasing as well.