The sun's energy causes our weather. Energy from the sun evaporates water from the oceans to make clouds. The sun's energy makes the wind blow. Oil, coal, and natural gas all came from plants and animals. Even the energy we get from water and wind came from the sun.
Some stars are much smaller, some are much bigger.
Some are much younger, some are much older. The sun is 6 billion years old. It will last another 6 billion years. Its energy comes from nuclear fusion reactions, as hydrogen atoms are converted to helium. Light from the sun takes 8 minutes to reach Earth.