Wow, I actually already learned all this in school this year! Too bad! I'd like to add on! Our star (the sun) is a medium sized star and is already middle aged. In another 5 billion years, it is likely to die. One of our nearest stars, Betelgeuse is a red super giant star which is about 700 times bigger than the sun! The sun is 600 times bigger than all the planets combined! So, you can imagine...