GEO 1111 Lecture Notes - Lecture 4: Supernova Nucleosynthesis, Stellar Nucleosynthesis, Nuclear Fusion

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: Robert Jack Cornett

Document Summary

If the universe was finite, it would collapse on itself. It doesn"t collapse because heat is produced and causes force in opposite direction. Nuclear fusion of elements higher than fe requires heat, which causes a planet to collapse due to a lack of heat, this is called the iron limit. Elements larger than fe are generated during supernova events. The universe is thought to be expanding because the light from other galaxies exhibits a redshift (type of doppler shift) Hubble observed a linear correlation between a star"s distance and its velocity, slope of line is hubble constant. First few minutes were hot, molecules moving quickly. Temperature dropped quickly to form nuclei, element heavier than be were not generated during big bang (the cooling was too fast, nuclear fusion wasn"t possible anymore) Gravity caused the clouds of h and he to condense, forming galaxies. Strong nuclear force keeps protons together in nucleus even though they repulse each other.