Stellar Evolution

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Stellar Evolution As a species, human beings have never actually witnessed the full process of stellar evolution. This is because from birth to death, a given star may survive for millions of years. Still, the text by Lutgen & Tarbuck (2011) tells, we have been able to devise a sense of the stages of stellar evolution based on the different phases in which we have been able to observe stars. These stages have been surmised to produce the process of stellar evolution. Stages: Stellar Birth Though we don't know for sure what force causes a gassy interstellar cloud to become a nascent star, there is some suggestion that a supernova or other astronomical explosion may be behind this event. Said event causes a mutual gravitational attraction to pull together dust and gas particles until they have become a contacted cloud. The movement of particles causes a heating of the cloud over millions of years to the point of achieving the protostar stage. Protostar Stage In the protostar stage, the body has not yet reaching a temperature where nuclear fusion is possible. During this stage, the body continues to rise in temperature until the process becomes much more rapid and the core collapses on itself. This state of thermonuclear burning creates a simultaneously growing outward pressure of hot gas and an inward pressure from gravity. When these pressures stabilize against one another, the protostar has become a star. Main-Sequence Stage This is the most stable phase of a star's

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