Listen people, you don't have to worry about any extraterrestrial cube coming towards Earth, or a solar flare that will melt the surface. Or anything like that, do not worry. What is really going to happen is Blazar. And it will destroy everything on Earth within a couple seconds. Every object in This entire solar system will be reduced to 1 mm thick space dust next year. There is no underground bunker that will save you from this. And every object within 4000 light years from Earth will also be reduced to 1 mm size space dust.