The sun is the nearest star to earth. It is a giant ball of plasma powered by the nuclear fusion reaction of hydrogen being converted to helium.

I am glad you asked. The sun is a huge star that provides light and heat to our planet, along with the rest of the solar system. The sun is located at the center of our planetary system and is mostly made up of hydrogen and helium. You can find more information here: http://en.wikipedia.org/wiki/Sun...