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Transcript
Stars: Nuclear Furnaces
Elemental Composition of Universe
Elemental Composition of Human Body
oxygen
carbon
hydrogen
nitrogen
calcium
Nuclear Fusion on Earth2H + 3H 4He + n + Energy
A Star is Born
Inside a Star
Inside a Star’s Core
Net Result: Fusion of Hydrogen to Helium
• 2H + 2H 4He + Energy
Production of Carbon:The Triple Alpha Process
The Carbon Fusion Cycle:Production of Nitrogen and Oxygen
Formation of Heavier Elements
• Fusion in star cores produces all elements up to Iron
• Supernova explosions produce all elements heavier than Iron