Oh dear....

[tlclark]

So do you really think humanity will die out eventually, I know its inevitable but I just cant picture a universe without humanity living on in some form or another.

I don't know about an asteroid blasting us out of existence, but I do know that Mr. Sun is halfway through his lifetime and will eventually go out, as will all the other stars. The ultimate fate of the universe is darkness and displaced, inactive energy. If we are still around when that happens... we won't be, but IF we were, there would be nothing we could do to save ourselves.

This was a plot device of the novel "Contact" not seen in the movie version. Entropy is the greatest threat to any civilization, so the greatest resource is intelligence, so all the intelligent lifeforms got together to work on the problem and recruited others to join them. The whole point of the "contact" was to get us working on the problem of surviving the end of the universe. The book has an interesting twist on that problem that I won't spoil, but it's really cool.

I hope that we have the physics to escape into the "multiverse" when this universe dies.