The Big Bang would have thrown debris in every direction. Is the debris (planets, stars, etc) that is furtherest away travelling at a much faster speed?
If so, then why does the density of the matter in the universe remain uniform throughout?
Isn’t it like a long distance race? Initially the athletes keep pace, prefering to cluster together, to conserve their energy (high matter density). But only when the finishing line is in sight, do the best runners break free from the rest of the group. The “density” of athletes is normally lower towards the end of the race as the gap between the athletes increases. Doesn’t the same apply in cosmology? Or is space a factor here?
Cosmological Principle states that on a large scale the universe is inotrophic and homogenous. (matter is evenly distributed and the universe looks the same in every direction providing you are not at some place special)