Also known as the year 5 billion or the billionennium bug. The Sun has been active for approximately 4.6 billion years. However, it only has enough fuel to go on for another 5 billion years (Y5B). At the end of its life, the Sun will start to fuse helium into heavier elements and begin to swell up and ultimately killing all life from Earth. There is also a large government conspiracy that tried to focus people on Y2K. More information about the conspiracy @ www.y5b.com