Have you ever wondered, "What will happen to our future when the sun dies?" The sun's life is about 10 billion years, and it is now about 4.6 billion years old. Eventually, the fusion reaction will end, and the sun will expand into a red giant. It may swallow the inner planets, including Earth. This will cause extreme warming, and the oceans will evaporate, creating a harsh environment. After that, the sun will release its outer layer and form a planetary nebula. Then, it will become a white dwarf and cool down. Understanding this life cycle of the star is the key to uncovering the mysteries of the universe and exploring future possibilities. In billions of years, we may need to consider moving to other star systems.