It could be or perhaps something far worse: the sun expanding, collision between the earth and a large asteroid and etc.
Don't confuse the "end of the world" which comes millennia after the second coming of Christ - according to Revelation and other Bible scripture. That's not to say some of the above doesn't occur during the period of tribulation.
Matthew 24:22 “If those days had not been cut short, no one would survive, but for the sake of the elect those days will be shortened."
You're a rocket scientist; don't take my word for it, continue your own research! :)
So how do the Christians interpret what the “day of God” means?