text: Our sun will never go supernova. Only the largest stars go supernova; ours is only about mid-sized. It has been around for about 5 billion years and has an estimated lifespan of 10 billion years. So, you've got another 5 billion years to relax before the sun's energy runs out.\n\nHaving said that, the Earth will not be habitable during that whole period. In about 2 billion years the sun will eject part of its core, becoming a red giant. It will grow dimmer but hotter. While the new outer limit of the sun will only reach out to about Venus's orbit, the extreme heat will incinerate all life on Earth.\n\nAfter the sun's lifespan is up, it will collapse back in on itself, forming a white dwarf. It will continue to emit a small amount of energy in this form as it cools down over the next few billion years. After it has cooled it will become a black dwarf, essentially a useless ball of matter.\n\nWe're actually lucky to have a mid-sized star. Blue giants only last about a billion years or so; they are bigger but burn through their fuel *much* faster. Smaller stars don't last long either; they aren't big enough to maintain a fusion reaction for very long.