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Astronomy & Astrophysics
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Clifford Orwin

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Lecture 17 Largest Asteroids Ceres with diameter 950km Asteroids are made of Metal and Rock They are rocky leftovers of planet formation Gravitational tugs from Jupiter prevented material from collecting together to form a planet Our Star Sun The sun does not cool off because energy provided by fusion maintains the pressure. When the Sun is in Gravitational Equilibrium the downward forces on each layer are balanced by upward force so the star neither expands nor contracts. Gravitational contraction Provided the energy that heated the core as Sun was forming, contraction stopped when fusion began Solar Wind is a flow of charged particles from the surface of the Sun Coronal holes are dark areas in an X-ray image of the Sun, it provide a corri
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