Discussão:Interview with Billy (1998)
Fonte: Futuro Da Humanidade
Where it says 85 quintillion years (85 x 1018) this could be incorrect as the German version states 85 Trillionen Jahre which is 85 trillion years (85 x 1012).
But according to http://de.wikipedia.org/wiki/Trillion it is correct (85 x 1018).