All it would take is a Pulsar to have fired (God only knows when, future or past) and if we are in the way of that blast - we wouldn't know it until we were dead. I don't know about you, but what is foretold in Revelation doesn't sound like a good time. If it's all the same to the good Lord, I would just as soon be room temperature when it happens.

And it could literally be any moment. https://nypost.com/2023/10/06/earth-hit-by-record-breaking-blast-from-death-star/