The conversation between human and AI assistant.
What are some alternate theories to the singularity existing at t=0 just before the Big Bang? What else could have existed just before the Big Bang?
Are there any other theories about the nature of the universe before the Big Bang that are being explored in cosmology?
Yes, some researchers are exploring the possibility that our universe exists as a bubble within a larger multiverse, and that the Big Bang was the result of a collision between our bubble and another. Others are investigating the idea that the universe is infinite and has always existed, in a state similar to how it is now.