In the old days people didn’t know what stars were so they thought they were holes in the sky. According to my research, our sun is a star and we are in the perfect position - not so far away that we will freeze from not getting enough warmth from this burning ball of death, but not so close that the burning ball of death will burn us up. Some of my favorite questions to ask were, how do stars form? How big is our star? How does a star die? Oh and this is going to make everything easier if you didn’t know, but a sun is a star.
Secondly, stars are too big to measure their diameter. Our Sun is 1.3 million times the volume(mass) of earth. Our star is 695,700 km. It may be the biggest thing in this neighbourhood, but the sun is just average compared to other stars. Some stars(sun) can be about 200,000,000 (200 million) degrees inside. Depending on how close it is to the core of the star it determines how hot it is.
Most stars take millions of years to die. When a star like the Sun has burned all of its hydrogen fuel, it expands to become a red giant. This may be millions of kilometres across. Big enough to swallow the planets Mercury and Venus. Dead stars are eight times the mass of the Sun. When they run out of fuel they swell into red supergiants, they are huge stars. They try to keep alive by burning different fuels, but this only works for a few million years. Then it blows apart in a huge explosion. In addition, a star’s life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life san. If the star is very small, with a mass only a tenth that of the Sun, it can keep fusing hydrogen for up to a trillion years, longer than the current age of the universe. Another way for a star to die is it to use up all it’s helium and hydrogen.