        Stars are born in high density areas of seat called nebulas. A nebula (as defined by Dictionary.com) is: A diffuse push- peck storage of interstellar dust or gas or both, panoptic as luminous patches or areas of darkness depending on the guidance the mass absorbs or reflects incident radiation. The head teachers are born because of the gravitational force of the nebula acts on itself, condensing the gas and dust into a proto brilliance.
        A protostar is a very small star. The protostar begins to heat up, and if it has copious guinea pig the cell nucleus temperature reaches 15 meg degrees Fahrenheit. At 15 million degrees Fahrenheit nuclear reactions occur in which hydrogen fuses to forge helium. The star then begins to release energy which stops it from contracting, and it causes the star to shine. When a star starts to shine it is called a primary(prenominal) age star. A star remains in main sequence depending on its solar mass. A star of close to 1 solar mass will remain in main sequence for ab show up 10 billion years. aft(prenominal) all of the stars hydrogen has been used to form helium, it begins to cool down and the helium fuses to carbon and the star expands, becoming a bolshy devil (when a star becomes a red giant with no more hydrogen left to burn it is step up of the main sequence.
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        The red giant keeps expanding until all of its helium runs out and then all of the outer layers drift away from the core as a gaseous shell. The gas that surrounds the core is called a Planetary Nebula. The core that is left then becomes a sportsmanlike dwarf. After the white dwarf cools down enough it stops shining and dies, forming a black dwarf.
        some other life cycle of a star involves a star with a mass...
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