Life Spans of the Stars.
Every star in the sky, including the Sun, is a ball of hot, burning pages with a life span of ten billion years.
Our Sun, which is considered a medium sized star, is already five billion years old and is only halfway through its life time.  In order ti jeep :shinning" the way it does now, thermonuclear fusion creates energy by combining the lighter atoms of hydrogen and helium into heavier elements such as carbon.
In five billion years the Sun will begin to cool down and start to expand, growing to more than 100 times the size it is now.  It will then be a red giant star.  In about another  hundred million years the core will collapse (like a deflating balloon) until it becomes so small it will be a white dwarf star.  The outer envelope of gasses will expand into space.
A massive star, which is at least three times bigger than the Sun and there are stars that are fifty times bigger), may die in a huge explosion that is called a supernova.
After a period of only a few years, a supernova can become either a neutron star or black hole.

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