Realistically, what would happen if we knew the world was going to end in ten years?

Say an asteroid is headed towards Earth, and we have some miraculous machinery that can tell us that it is for sure going to hit us, and our dear planet will be erased from history. What would humans do? Would we start trying to colonize the moon? Would we just accept it and start being nicer to each other? In ten years, could we build something to travel out into the far reaches of space and stop the asteroid in its path? (I’m pretty sure something like that is impossible, but hey its just hypothetical.)

So, what would we do?