I think cosmologists use a poor choice of words when they say the universe is expanding. I don't dispute any of the science behind the "expanding" universe but I do want to dispute the appropriateness of the phrase to the science. I think people typically understand expanding to mean: getting bigger. But the size of the universe is unknown. It may be finite or infinite and if its the latter the "expansion" of space does not mean the universe is getting bigger. It may have been infinite in spatial extent even at the big bang. Many people cannot understand how this could be so, because they think space is expanding in the sense of "getting bigger" hence it could not have been infinite in size at the big bang. Therefore they rule out the infinite universe on the grounds of the poor understanding that was given to them by a bad phrase. I think the public are literally being misled by the cosmological community. i don't think this is done intentionally by the community. Cosmologists known that what they mean by expanding is the scale factor is increasing over time. But what the public understand by it is not the same. Cosmologists are familiar with bad phrases being forced upon them by history. For example big bang implies a conventional explosion in space, but I have often heard cosmologists frequently saying big bang is a bad phrase and trying to correct the misunderstanding. I don't think I have ever heard cosmologists trying to say that the universe is not expanding, in the sense of "getting bigger" which is incorrect rather than the scale factor is increasing which is correct. Consider three phrases to describe the situation in layman terms: 1 the universe is expanding 2 the observable universe is expanding 3 the universe is stretching To me , 1 is what is used all the time and it is wrong or perhaps not wrong but misleading (after all the universe could be finite we just don't know. But 2 and 3 could easily be used instead without referring to technical terms such as the scale factor and would help understanding. Interested to see what people think.