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Transcript
Stellar Evolution What is the fate of the sun and other stars?? Formation of Stars • Begins with interstellar gas and dust called a nebula • Collapses on self as a result of gravity • Rotates and flattens with hot condensed object at center called a protostar • When temperature becomes hot enough for nuclear fusion to occur Hydrogen (H) and Helium (He) are the first reaction. • A star is born. Lifecycle of a Medium Star • 10 % of a stars innermost mass react in nuclear fusion • When H in core is gone, some left in outer layers • Outer layers expand and cool; star becomes a Red Giant • Red giants have low surface gravity, outer layers are driven away • Core becomes hot enough to produce Carbon (C) • Star contracts to normal size when helium is used up • Carbon core left over, White dwarf remains Lifecycle of Massive Stars • Massive stars undergo many reactions and produce many elements • Cannot support themselves and violently collapse on themselves • Neutron Star – Collapse dense core of a star that forms quickly while its outer layers are falling inward • Supernova – Massive explosion that occurs when the outer layer of a star are blown off • Black Hole – Small, extremely dense remnant of a star whose gravity is so immense that even light can not escape its gravity field
