If the universe is only 13.8 billion years old, and nothing can travel faster than the speed of light (1 lightyear per year), how can the observable universe possibly be nearly 100 billion lightyears across? How do we reconcile the sheer size of the universe with the understanding that it all emerged from an infinitely dense point not so long ago?
In: Physics
The universe is as large as it ever was or ever will be. When people say the universe is expanding, what that equates to is that it is decreasing in density. The initial singularity before the so called big bang would have been just as infinite, though likely in a different sense/mechanism, as the current universe is apparently infinite now.
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