hi, thank you for your honest question. I appreciate it. if the sun explodes, according to theory, the shockwaves will not be enough to destroy the whole earth. it will be only enough to destroy the side of earth which facing the sun at that exact moment. The other side will experience sudden increase in the temperature and will experience complete darkness. lastly will float away from solar system and experience total ice age. humans or any other living things will be unable to live on the surface and will only able to live in the underground bunker and they might have around 1000 years before totally extinct. just theory. hahaha..