How Can We See Galaxies 47 Billion Light Years Away

How Can We See Galaxies 47 Billion Light Years Away When the Universe is Only 13 Billion Years Old?

clipped from www.astronomybuff.com How Can We See Galaxies 47 Billion Light Years Away When the Universe is Only 13 Billion Years Old? This 2003 paper in Physical Review Letters puts a lower limit on the size of the universe at no smaller than 46.5 billion light years in radius. If the universe is geometrically flat, that is. But, ignoring the details for a minute, what I’m really trying to do here is show that the size of the universe isn’t simply the light travel time over the age of the universe. The expansion of the universe requires that you apply a scale factor as outlined above.