The Sun and Special Relativity Guided Notes.docx - The Sun...

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The Sun and Special RelativityGuided NotesInterior Structure – ObservationsSome things we can observe about the Sun include:1. Mass and density2. Surface temp (5800 K) and energy flow (luminosity)3. Composition (75% H, 24% He, and 1% everything else)4. Helioseismology (Sun Vibrations)5. Neutrinos from core (direct evidence of nuclear processes)Test Yourself – Measuring MassHow do we tell the mass of the Sun?A. From its size and densityB. From the speed that it moves around the galaxyC. From the motions of the planets orbiting itD. From the Sun’s spectrumYour answer: C) From the motions of the planets orbiting itInterior Structure – Physical ModelsThe Sun is neither expanding nor contracting.The force pulling in is gravityThe force pushing out is internal gas pressureThe pressure must keep going up as we move deeper into the SunIn an interior model of the Sun, the following must be true:1. All points must have balanced forces2. Heat flow matches observed luminosity
3. Overall mass and density match observationsTest Yourself – Pressure Changes in a FluidAs a submarine goes down in the ocean, the pressureA. IncreasesB. DecreasesYour answer: A) IncreasesYour Turn – Calculating Pressure Changes in FluidIf the pressure at sea level is 1 atmosphere, what is the pressure at depth A?
What is the pressure at depth B?

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