- #1
curioushuman
- 16
- 0
Hi all. I relish hearing from our great cosmological explainers like Neil DeGrasse Tyson and Brian Greene and watch whenever I find something new on youtube, but one thing that I don't understand and haven't heard anyone specifically address is that, if the part of the universe we are able to see is smaller than the actual universe (owing to space expanding faster than the speed of light over all or part of the last 13 billion years), then how is it possible for us to see the cosmic background radiation (CMB) in all directions? Doesn't the CMB radiation represent the furthest back (in time) that we can detect how our universe would appear? And if that's the case, if we are able to see THAT in all directions and if that is the oldest thing we could possibly see, how could there be something beyond it (more stars and galaxies) that we are not seeing?