In this FAQ at the Baez website, the big bang singularity is contrasted with a black and white hole as a possible beginning of our universe. Is the Big Bang a black hole? http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/universe.html [I'm not interested in answering the title question,which is NO, but rather exploring the differences.] A few major differences are outlined: So, the first sentence appears to be a major distinction between a BB and a BH. ok. Three questions: what about the temperature difference between the two....less than 3 degrees K for many black holes and 1028 degrees K for the big bang....Does this manifest in the differences or is temperature relatively unimportant? Also, Is SPACE hardly curved at the big bang, just time, while for a black hole both space and time are severely curved?? If so, does the extreme curvature of time relate to the temperature difference? to the initial expansion/repulsion? Do we have any quantum insights yet that support, contradict or offer other insights? edit: from another thread, I saved this partial insight: Pervect: "Because the stress-energy tensor for expanding matter is different from the stress-energy tensor of non-expanding matter, you can have compact, dense, expanding objects that are not black holes." ok.