In response to the question posed by Ann; “Do mormons believe in an eternal universe of eternal matter or a big bang type universe?”
To answer this question requires a more than a one or the other type of answer because the answer is “yes” to both…sort of. Well, it depends on what you mean by “big bang”. As I understand things, it’s fairly settled science that everything in the universe is moving away from a center point. This loosely supports the big bang theory, although I have not heard it explained as to why everything is moving away from that point at an accelerating speed. Now that’s just kind of weird, but I digress.
If the question is “Do Mormons believe everything is moving away from a center point of the universe?” then the answer is that Mormons don’t have any doctrine to that effect, although Mormons generally regard any scientific knowledge or discovery as interesting and valuable, since we believe we’re all children of God, destined to become like him, and since God knows everything we’re interested in knowing everything as well.
Just as well for any other aspects of big bang theory. Science doesn’t have all the answers yet and can’t fully explain the big bang, so there’s nothing Mormons can truly agree or disagree with. It’s mostly theory and hypothesis.
The one part of Mormon doctrine that touches on this subject is that our scripture says that everything has always existed. Not necessarily in its current form, but that there’s no such thing as creating something out of nothing. So if one assumes that a belief in the big bang means you believe that a bunch of stuff came out of nowhere, then no, Mormons don’t believe in that. But if nowhere actually means “nowhere” as in “we don’t know where it came from” then sure, there’s nothing in our doctrine to preclude a belief in a big bang.