Lecture12 - Astro Nova Large Scale Dark Matter Revealed by...

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Astro Nova Large Scale Dark Matter Revealed by gravitational lensing 270 Mly size Microsoft announces a virtual observatory WWT (World Wide Telescope) MIT awarded study contract for a lunar radio telescope To be located on far side Low frequencies Explore “Dark Ages”
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First Exam Tuesday March 11 5:00 pm – 6:20 pm Physics Lecture Hall Closed book and notes Computer-graded multiple-choice questions Material covered: Text chapters 5.3, 6.1, 6.2, 16 - 21 Lectures 1-14 (January 22 through March 6) Bring Student ID card and a #2 pencil Practice Exam on class web page
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Previous Lecture Nuclear binding energy – fusion only to 56 Fe WD mass limit: 1.44 M Sun Inverse beta decay, Neutron Stars Supernovae Two types (I and II) Light curves Core collapse SN; SN 1987a WD supernovae SN remnants Neutron Stars and Pulsars
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New Quiz Policy Three quiz questions will be given, one near beginning of lecture one near middle of lecture one near end of lecture
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Quiz Question 1 A neutron star is about the size of: A. the Sun B. the Earth C. New Jersey D. New Brunswick E. the Physics Lecture Hall
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Pulsars Periodic radio sources pulse periods of seconds Æ milliseconds extremely regular – almost perfect clocks Discovered in 1967 LGM? Unlikely – no modulation of signal main sequence stars? R sun = 6 x 10 8 m = 2 light seconds can’t vary faster than 2 second period Sound
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White dwarfs? R WD ~ 0.01 R Sun = 20 light ms size ok but if rotating at ms periods, equatorial centrifugal force would tear it apart similarly, pulsation period of WD is too long Neutron star? R
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Lecture12 - Astro Nova Large Scale Dark Matter Revealed by...

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