Just How Big Is the Universe Anyway?
Tuesday, August 9th, 2011
The generally accepted age of the universe is slightly less than 14 billion years. Given that the speed of light is a barrier for how fast things can travel through spacetime, one would think that the size of the universe would then be about 28 billion light-years in diameter. Not so! Because even though matter travelling through spacetime cannot reach the speed of light, spacetime itself can expand much faster than lightspeed. Recent research puts the estimated size of the universe at more than 250 times that of the visible universe.
Link: http://www.technologyreview.com/…
(via Slashdot)
