Transcription
What happens if we discover the universe has always existed? Cuz it might have. We know there's a thing called the big bang, but it might have been something that happened in a pre-existing universe. Maybe that's eternal.
Are we more comfortable with a universe that began? Or would we be more comfortable with the universe that had always existed? Why is there something rather than nothing? Presupposes that nothing is more likely than something whereas it might be the other way around.
Einstein really felt initially that an eternal universe was more natural. It's also true to say that his theory general relativity strongly suggestive of there being a beginning and/or an end. The theory itself strongly suggests that.
Then we saw the universe was expanding. We observe that and then we've now seen the oldest light in the universe, the cosmic microwave background radiation which is the afterglow of the big bang. So we know that the universe was hot and dense 13.8 billion years ago. There's multiple lines of evidence that tell us the universe was hot and dense, but none of that tells us that that was the