# How does cosmological principle imply an expanding space?

My understanding of cosmological principle is this:
Space looks same in all directions and is homogeneous. But this principle was under heading of Observational Evidence for expansion of space in this article:

My question is, how does Cosmological Principle imply an expanding space?
If it's my understanding of cosmological principle which is flawed, I would highly appreciate if someone corrects me. Thanks in advance!!

• The cosmological principle states that at any given time the Universe is isotropic and homogeneous - which allows for constant curvature. In general relativity, there are typically 3 choices for curvature, $k=1,0,-1$. As far as an expanding universe is concerned, it's by fiat. It's consistent with Big Bang Theory - which is consistent with the Old Testament of the Bible. The Hubble data, however, looks like random sequence - it's not clear that red shifts imply velocity - and quasars which were believed to be on the "edge" of the Universe are actually in our Local Super Cluster. – Cinaed Simson Apr 4 at 7:28
• It does if combined with other hypothesis or observations. – Alchimista Apr 4 at 8:51