1 http://www.youtube.com/watch?v=oQMYGaKFdlM
2 http://www.youtube.com/watch?v=8UfkvXsHzlw
3 http://www.youtube.com/watch?v=xq82GsLgat0
4 http://www.youtube.com/watch?v=kAj_y1H5Wpo
5 http://www.youtube.com/watch?v=qgmi7Tw_ZuA
"The life-giving sun is the most powerful force in our solar system. But the sun is aging and eventually will die. Can Earth survive without it?"