A meteor come to kill all. You prefer to know with anticipation or dont know until the rock hit us?

Quote from ultraaviolet

Plus if you did know maybe you could try and do something about it. I'm mot sure what but at least you could plan something

For what i could find, our better option is send some space ships with nukes with the purpose of change the orbit of the meteor, if that dont work we are fuck. BTW, when i say "We" i mean the NASA, we cant do shit.