Neutron Stars
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This lecture deals with Paradise IV, VI and X. At the beginning of Paradise IV, the pilgrim raises two questions to which the remainder of the canto is devoted. The first concerns Piccarda (Paradise III) who was constrained to break her religious vows. The second concerns the arrangement of the souls within the stars. The common thread that emerges from Beatrice's reply is the relationship between intellect and will. Just as Piccarda's...more
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This lecture covers Paradise XXIV-XXVI. In the Heaven of the Fixed Stars, Dante is examined on the three theological virtues by the apostles associated with each: St. Peter with faith (Paradise XXIV), St. James with hope (Paradise XXV), and St. John with love (Paradise XXVI). While mastering these virtues is irrelevant to the elect, it is crucial to the message of reform the pilgrim-turned-poet will relay on his return home. Dante's...more
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In this lecture, Professor Mazzotta examines Paradise XVIII-XIX and XXI-XXII. In Paradise XVIII, Dante enters the Heaven of Jupiter, where the souls of righteous rulers assume the form of an eagle, the emblem of the Roman Empire. The Eagle's outcry against the wickedness of Christian kings leads Dante to probe the boundaries of divine justice by looking beyond the confines of Christian Europe. By contrasting the political with the moral...more
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This lecture focuses on Paradise XXVII-XXIX. St. Peter's invective against the papacy from the Heaven of the Fixed Stars is juxtaposed with Dante's portrayal of its contemporary incumbent, Boniface VIII, in the corresponding canto of Inferno. Recalls of infernal characters proliferate as the pilgrim ascends with Beatrice into the primum mobile. Bid to look back on the world below, Dante perceives the mad track of his uneasy archetype,...more
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The atom, proton, neutron and electron.
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Guest lecturer Dr. Geoff Marcy gives a lecture entitled, "Planetary Systems Around other Stars," for Professor Lynn Rothschild's Astrobiology and Space Exploration course.
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Rotating Rigid Bodies, Moments of Inertia, Parallel Axis and Perpendicular Axis Theorem. The moment of inertia for a rigid body around an axis of rotation is introduced, and related to its rotational kinetic energy. Flywheels can be used to store energy. Planets and stars have spin rotational kinetic energy, and the Crab Nebula pulsar is presented as a spectacular example.
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Angular momentum (a vector) is introduced. The rate of change of angular momentum is related to the torque (also a vector). In the absence of an external torque, angular momentum is conserved. Spin angular momentum (of planets, stars, neutron stars) is also discussed.
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This course is a first-semester freshman physics class in Newtonian Mechanics, Fluid Mechanics, and Kinetic Gas Theory. In addition to the basic concepts a variety of interesting topics are covered in this course: Binary Stars, Neutron Stars, Black Holes, Resonance Phenomena, Musical Instruments, Stellar Collapse, Supernovae, Astronomical observations from very high flying balloons (lecture 35), and you will be allowed a peek into the...more
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In addition to the traditional topics of mechanical vibrations and waves, coupled oscillators, and electro-magnetic radiation, this course also discusses musical instruments, red sunsets, glories, coronae, rainbows, haloes, X-ray binaries, neutron stars, black holes and big-bang cosmology.
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In this closing lecture, Professor Lewin talks about some of the highlights from his early days at MIT. It began with balloon flights at very high altitude to make observations of the stars in X-rays. This led to discoveries of X-ray flaring events and a periodic X-ray source (GX 1+4). In the seventies and eighties he made important contributions to our understanding of X-ray bursts (thermo-nuclear fusion episodes on neutron stars).
