Expansion of matter Actually editor 161 28 196 13 was attempting to make a pretty good point though it was somewhat unpolished I think what he was trying to point out was that the dimensions of quantum particles are determined by fundamental constants which are thought to be stable over time That is a proton today has the same radius it had when it was created I don t think the article s phrase expansion of space and matter intended to mean that these particles are a different size than they were previously but it is unclear and could be construed that way So a rephrase of that statement would be beneficial