How Does Fusion Power the Sun?

The Sun contains 99.8 percent of all matter in the solar system. Under crushing pressure and extreme temperatures generated by gravity, the violent process of nuclear fusion powers the tremendous energy output of the sun. | http://science.discovery.com/tv-shows/how-the-universe-works/ Watch full episodes: http://bit.ly/HTUWFullEpisodes Subscribe to Science Channel: http://www.youtube.com/subscription_center?add_user=sciencechannel Check out SCI2 for infinitely awesome science videos. Every day. http://bit.ly/SCI2YT Download the TestTube app: http://testu.be/1ndmmMq