１２ Life of Stars

１２　Life of Stars【What is the Universe？】Dialogue with the Universe

・Big star burns out faster than small one.
　（Since stars have a limited supply of hydrogen in their cores, they have a limited lifetime as main sequence stars. This lifetime is proportional to f M / L, where f is the fraction of the total mass of the star, M, available for nuclear burning in the core and L is the average luminosity of the star during its main sequence lifetime. Because of the strong dependence of luminosity on mass, stellar lifetimes depend sensitively on mass.）[1]
• The lifetime of the sun is about 100 million years. The life of stars of 10 times weight of the sun is from 1 / 1000 to 1 / 100.
・The Sun formed about 4.6 billion years ago. It will exit the main sequence in approximately 5 billion years and start to turn into a red giant. [2]

【Refereces】
1. The Life and Death of Stars NASA
http://map.gsfc.nasa.gov/universe/rel_stars.html
2. Wikipedia：Sun
https://en.wikipedia.org/wiki/Sun#Life_phases