Recent content by fmichel

I have just listened the cosmologist Hubert Reeves on a radio broadcast. He says that there are clusters of galaxies, superclusters of galaxies, but he also says that there are no super-superclusters of galaxies. My question is the following: do we know why there are no super-superclusters...

Ok according to this article, the Hubble parameter depends on a function H(t) who is unknown. I would like to learn more about the possible structure of the universe and about its evolution. Are there interesting books, articles, or documents on the Internet? All suggestions are welcome. Thanks.

Ok the universe has an infinite size since the beginning, but there was an "infinitely dense state" at t=0. What does it mean? Does it mean that all the matter was concentrated in one point? In that case, at what time was the matter present everywhere in the infinite space? In the past, was...

Is that true that at the Big Bag (time t=0), the size of the universe was zero? I have difficulties to imagine how the universe can: - have an infinite size since t>0 - has matter at any location in space since t>0 - was concentrated on one point at t=0 It would means that there was an...

Ok thank you. I do undestand now how an infinite universe could be expanding. About my other question: if the universe has an infinite size, does it mean that there is an infinite number of stars? (instead of the number of stars, I could as well have used the total amount of energy, the total...

I sometimes read that we know that the universe is in expansion and that we don't know if the universe is finite or infinite. I have some difficulties to understand the notion of "infinite universe" and to see how an infinite universe could be in expansion. Assume the universe is infinite...