# Ch16.pdf - Dr. Morales Astronomy M01 Introductory Astronomy...

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Dr. Morales1Astronomy M01Introductory AstronomyBy Dr. Morales0Sources of Sunshine: Thermal and Gravitational EnergyMass, Energy, and the Theory of RelativityThe Solar Interior: TheoryThe Solar Interior: Observations 582Ch. 16: The Sun – A Nuclear PowerhouseDr. Morales11
Dr. Morales2Thermal & Gravitational Energy19thcentury scientist knew of 2 possible sources forʼs E:1.Chemical: Burning (oxidation) = most familiar chem. E.(i.e. wood, coal, gasoline fuel, etc.)2.Gravitational Energy: Calculation required ~40 meters/yr (undetectable!) beenough for ~100 Myrs, w/shinning @ present rate.Charles Darwin was discouraged by resultHad evidence of fossils in rocksàAge >3.5 Byrs,so AgeÅmust have been suitable for life as long as thatConservation of EnergyèEnergy cannot be created nor destroyed,but can be transformed from 1 form to another.(i.e. heatàmechanical: steam engine) EheatàEmeachanicalDr. Morales22Mass, Energy & Theory of RelativityIn 1905, Albert Einstein published the Special Theory of Relativity(set of 4 papers + a few more later)Mass is a form of E:Because c2= # so large,a very smallmàa very largeEi.e. 1 gm of matter,à15,000 barrels of oilE radiated by= produced by4 Mtons of matter / secBut how?2mcE=E = energym = massc = speedof lightDr. Morales33
Dr. Morales3Elementary ParticlesElementary Particles = fundamental components of matterProton, neutron, e-, etc.

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