PiledHigher wrote:Marx wrote:Anyone here amazed at the fact the universe is currently expanding at an increasing rate?
The edges are moving at the same rate, the relative rate between two objects within the sdges is increasing.
At 4 months you can Put this down as one of the slower responses to a post, but....
Is there such a thing as an "edge" to the universe? How could there be an edge to a 4 dimensional space-time continuim? i suppose you could say that the big bang is one "edge" and right now is the other. So, assuming that the rate of the passing of time is constant, then Yes, the edge is moving at the same rate. But how would we know if time wasn't constant? We're sitting here in "it". We are not privileged observers.
The best analogy for the expanding universe is the 2-dimensional space occupied by the skin of a plastic ballon as you blow air into it. Forget about the inside or outside of the balloon. Imagine that your 2-dimensional the universe consistents only of the plastic skin. As it stretches and expands every point gets further away from every other point, so there is no edge and no centre, everywhere is the edge and everywhere was the centre.
In our universe the galaxies are those points. Inside the galaxies we seem to be keeping our size and shape.
And the universe doesn't expand into empty space, space is what the universe creates as it expands.