I am at the lowest level of the spectrum when it comes to this subject, but this has always raised some questions for me. If someone could answer a few of these I am almost positive it will just create more questions in the future, but I would still appreciate it. So here goes. 1. I understand the concept that "nothing" existed before the big bang such as time etc. but does this mean that the big bang spontaneously created matter and if it didn't is that not proof something existed before it? Also is it even possible to create matter of any kind even a quark from nothing? 2. Since the universe is of completely unknown proportions and we have to viable way to determine the "center" of the universe could the formation of new (insert cosmic body here) account for expansion? 3. Is it very responsible of us to make theories based off of observations we collect from a sample size that we have no way in determining it's relation to the whole? Such as the estimated age of the universe; which from what I understand we gain a large portion of data from the oldest star we can observe but do so in knowledge that there very likely are stars older that we can not see.