How will the world end?

It will have to be something more powerful that man if the entire earth is destroyed. So I am with you on the asteroid theory

all the worlds nuclear rectors will melt down and everyone will die from radiation poisoning all that will be left are cockroaches

It will be burned up with fervent heat

disease and famine.

We get swallowed by a black hole.

Pandemic creation

With a big bang.

With God's wrath.