Thu 17 Nov, 2011 02:08 pm
If the universe started in the Big Bang about 13 billion years ago, and the speed of light is a universal speed limit, shouldn't the maximum size of the universe be about 26 billion light years across as opposed to the 93 billion light years that I have heard.
The age of the universe is about 13.75 billion years, but due to the expansion of space we are observing objects that were originally much closer but are now considerably farther away than a static 13.75 billion light-years distance. The expansion of space is the increase of distance between distant parts of the universe with time.
There is a difference between the speed of light and the speed of expansion.