It may be actually the end of something else entirely.
Its possible there was a Universe before the Big Bang from which our Universe came.
“You know,” said Arthur, “it’s at times like this, when I’m trapped in a Vogon airlock with a man from Betelgeuse, and about to die of asphyxiation in deep space that I really wish I’d listened to what my mother told me.”
“Why, what did she tell you?”
“I don’t know, I didn’t listen.”