Mainstream science says that, since the big-bang, approximately 13.6 billion years have passed, 13.6*10^9 years.
What happened before the big-bang is speculation. If there was already a Universe, so much the better, but we don't know.
I'm surprised that no one mentioned anti-matter when someone talked about negative energy...
What happened before the big-bang is speculation. If there was already a Universe, so much the better, but we don't know.
I'm surprised that no one mentioned anti-matter when someone talked about negative energy...