2015-03-20 BBC:星光七纪元-18（在线收听）

Now the Sun will be burning hydrogen as the stars doing in the main sequence until the hydrogen is exhausted in the core, and at that point the stars start to die, the outer layer of the Sun will expand, the Sun will move away from the main sequence to become a red giant star.

From the apparent disorder of the night sky, a map had been created on which you could chart a star's journey through life, it revealed that the fate of our own star was written in the night sky, once its hydrogen runs out, it will head off the main sequence and move into the next phase of its life as a red giant.

Middle weight stars like our Sun don't age gracefully, but catastrophically, they swell up and become some of the largest most bloated stars in the universe, stars 200 times the size of our Sun, thousands of times brighter, stars that are some of the most destructive in the universe, but also the most creative, shining a rancid red in the inky sky.