Extinction means the end.   The  ultimate fate of our universe  depends on your scientific beliefs. If the universe goes through a repeated series of Big Bangs and Crunches by expanding and contracting, there might be no end. However, the prevailing sense today is that the universe will continue to expand and reach the Big Chill where everything approaches absolute zero, oh, maybe  100 trillion years from now . However, there are too many unknowns, like the effect of dark energy/matter, etc., to know for sure. A more sensible, but equally futile, analysis has to do with the 10 most likely ways for humanity to disappear.  Every few years, some one or organization makes such a prediction.  Here is new effort, a book published on 17July2025,  The Anti-Catastrophe League , by  Tom Ough .  #10 - Asteroids One of the biggest was a 9 mile wide monster that led to the extinction of dinosaurs 66 million years ago. On 30June1908, mere 200 footer (...