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When a star begins to run out of fuel,the center of the star shrinks and the outer parts of the star expands star become a red giant or supergiant.All main sequence stars eventually become red giants or supergiants.However what happen next depend on the mass of the star's as Exploring the Live of Stars shows.When a star run out of fuel, it becomes a White Dwarf,a Neutron Star,or a Black Hole.
When a star begins to exhaust its hydrogen supply, its life nears an end. The first sign of a star's old age is a swelling and reddening of its outer regions. These are called red giants.The Sun, which is a middle-aged star, will probably swell to a red giant in 5 billion years, vaporizing Earth and any creatures that may be on its surface. When all its fuel has been exhausted, a star cannot generate sufficient pressure at its center to balance the crushing force of gravity. The star collapses under the force of its own weight. Very massive stars can go supernova and leave behind a neutron star or black hole. Small or average-sized stars (like our Sun) leave behind a white dwarf.

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14y ago

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