Okay, first off let me say hello, I am new here. I am creating this thread in the hope that I can get some answers to some questions that are bugging me. Please keep in mind that I am not educated in physics so some of my questions might seem silly. Also, feel free to write responses as lenghty as you feel, the more precise you explain it, the better. 1) What does the B.G.V theorem tells us? a. Does it say "our Universe" had a beginning or "The Universe" (aka "everything") had a beginning? b.One common argument I hear is the the B.G.V theorem uses classical space-time and since we don't have a theory of quantum gravity, the theorem does not hold. But I think Alexander Vilenkin addressed this. c. I remember that Sean Carroll got Alan Guth to say that he thinks the Universe is in his view Eternal. You might say that is his opinion but how can one of the authors of a paper that shows the Universe had a beginning say that? 2) From what state does the Universe begin to exist in the B.G.V theorem? a. Is it timeless? b. Can it be eternal? c. Does it need a cause? Can it just BE? d. Is it immaterial, spaceless, timeless ? 3) What is the "physical nothing" Lawrence Krauss talks about? a. Again. Can it be or is it eternal or timeless ? 4) If our Universe began to exist and had a cause does that cause have to be immaterial, timeless and spaceless? 5) Could I get an opinion on the following "The definition of “singularity in the past” is not really the same as “had a beginning” — it means that some geodesics must eventually come to an end. (Others might not.) Most importantly, I don’t think that any result dealing with classical spacetimes can teach us anything definitive about the beginning of the universe. The moment of the Big Bang is, if anything is, a place where quantum gravity is supremely important. The Borde-Guth-Vilenkin results are simply not about quantum gravity." - Sean Carroll 6)I heard that hartle-hawking no boundary proposal shows that our Universe could have a beginning but no cause. Can someone explain how that works? Feel free to answer my questions in whatever format you want.