we cannot See the whole universe.
light unable to cross in age of universe
hubble sphere
there are multiple reasons for this (maybe i’m missing some):
1. given the speed of light, in all likelihood (we can’t tell) the diameter of the universe is larger than the distance light can travel in the age of the universe; so that light has yet to reach us, and
2. given that the universe is expanding (so that all objects appear to be receding at a speed proportional to their distance when observed from any point in the universe), after a certain distance (called the hubble distance, which varies), the rate of expansion of distance is the same as or more than the speed of light: so that that light will NEVER reach us.
