Why do people always think the world is going to tend?

Well I do believe it's going to end, but not in a lonnnnngggg time. I extended the letters of long to show you how LONG it is. As we've all learned in school, every star will eventually die, including the sun. Now, when the sun dies, it doesn't just go dead, it brings everything around it down, so our small small world will end one day, but not in our lifetime.