AST201_winter2011_lecture_notes_feb1_v1_Bb

AST201_winter2011_lecture_notes_feb1_v1_Bb - AST 201 Stars...

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Unformatted text preview: AST 201 Stars and Galaxies 1 AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid The Sun AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 2 AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 3 AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 4 AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 5 Image credit: NASA/Trace AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 6 pressure from heat generation pushes outward gravity pulls inward We say that the Sun is in hyrostatic balance between gravity (in) and thermal pressure (out). AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 7 AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 8 E=mc 2 AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 9 energy mass AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 10 E m AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 11 E = m ? No, they have different units (Joules and kilograms) AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 12 E = mc 2 A single free-floating proton has a mass of 1.00728 u. AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 13 1.00728 u 1.00728 u 1.00728 u 1.00728 u 4.029 u, right? If you smash four of them together, you ought to get something with a mass of 4 x 1.00728 u = 4.029 u, right? But you dont! You get a helium nucleus with a mass of 4.003 u! AST 201, Winter 2011, University of Toronto, Dr. M. A. Reid 14 1.00728 u 1.00728 u 1.00728 u 1.00728 u 4.003 u 4.029 u 4.003 u = 0.026 u of mass is converted to energy (in the form of light). converted to energy (in the form of light)....
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AST201_winter2011_lecture_notes_feb1_v1_Bb - AST 201 Stars...

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