My thread on The Book of Revelation was removed, and it comes as no surprise.
well, duh, you posted it on the wrong board.
But we'll know when the end times will occur when we figure out what is the value for the Density parameter, Omega (Ω), defined as the average matter density of the universe divided by a critical value of that density. Then we'll know whether the universe will end in a Big Freeze, Big Rip, or Big Crunch. Times range from 20 billion to many trillion years. Or it could be the Big Bounce, or multiverses with no end.
Of course for humans to survive the end of our sun in about 5 billion years, we'll need to colonize other solar systems.