According to Tyson, civilizations can be wiped out by cosmic events like supernovae, natural disasters such as the Toba disaster, or even self-destruct through war or other means, making probability estimates difficult.
Peradaban bisa musnah akibat peristiwa-peristiwa kosmik sepert supernova, bencana alam seperti bencana Toba, atau bahkan kehancuran sendiri melalui perang atau cara lain, sehingga kemungkinannya sulit diketahui.