Does anybody know when will Earth end?

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Earth is 4.5 billion years old. I'm sure earth's life is gonna end somehow, the question is " when"? What will happen to the people living on earth by that time it stops turning? Will they transfer to Mars? Or maybe by that time no more humans on earth because nuclear war had already errupted. NASA keep on sending probe to other Galaxies to try to find other planets with similar atmosphere to earth. What if they don't find any? Will it be the end of the human race? Questions....