lecture10 - The History of Earth and Life Lecture 10 1...

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The History of Earth and Life Lecture 10 1 Lecture 10 - Origin and History of the Universe Lecture 10 - Origin and History of the Universe 1. Hubble’s Law Again - The Universe is Expanding 2. Cosmological Models Steady-State Model Big Bang Model 3. Origin and History of Universe Big Bang History of Universe Curvature of Space and the future of universe 4. Nucleosynthesis: Origin of Elements Hubble’s Law Again Distant Galaxies are “Moving Away” (Red Shift) Universe is Expanding Two cosmological models proposed to account for the expanding universe: Steady- State and Big Bang Steady-State Model Universe Was Eternal and Unchanging As the existing matter move apart galaxies form from newly created matter to keep the density of the universe constant “Perfect Cosmological Principle”: Universe has always looked the same to all observers The Universe is eternal and unchanging This Model Was Disproved Old objects (far away) have higher density (universe changed) Cosmic Background Radiation predicted by Big Bang Model was discovered Big Bang Model Universe Was Created in An Explosive Event (Big Bang) Universe is expanding as a consequence of that event Universe looks the same to all observers but changes through time
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lecture10 - The History of Earth and Life Lecture 10 1...

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