Life+Cycle+of+a+Star



**PROTOSTAR = FETUS**

**FUSION IGNITION = INFANCY THROUGH ADULTHOOD**


 * RED GIANT = MIDDLE AGED **


 * WHITE DWARF = OLD AGED / DEATH **
 * **why do smaller stars have longer lives? **
 * Smaller stars live longer because they have a smaller mass. **
 * **how long will a medium star live in the main sequence phase? **
 * A medium star will live in the main sequece for about 50 million years. **
 * **after a star enters “old age,” how long will it still live? **
 * How long it takes for a star to die depends upon its initial mass. A lower-mass star like the sun can survive for billions of years, but after the hydrogen and helium fuel is gone it cannot get hot enough to fuse carbon. **

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