Lecture07 - Astro Nova February 12 1809 Birthdays Darwin &...

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Astro Nova February 12 1809 Birthdays NASA Contest – name GLAST Gamma-ray Large Area Space Telescope May 2008 launch Superfast Star HE 0437-5439 723 km/s B V 8 M Sun Black hole – binary disruption in LMC?
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Previous Lecture Star formation in giant molecular clouds normally stable, need trigger to start collapse Hydrostatic equilibrium and gravitational collapse Angular momentum and its conservation produces disk-like structures Protostars cool and luminous their evolution on the HR diagram
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Quiz Question 1 Your professor is sitting on a rotating stool, holding two weights near his chest. When he lifts one weight overhead and lowers the other between his knees, what happens? A. his rotation rate speeds up B. his rotation rate slows down C. his rotation rate does not change D. he starts to rotate about a horizontal axis E. he falls off the stool
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Quiz Question 2 Your professor is sitting on a stool that is free to rotate, but is currently at rest. When he begins to swing a basketball on a rope over his head, in a clockwise direction, what happens? A. nothing – he stay at rest B. he begins to rotate in a counterclockwise direction C. he begins to rotate in a clockwise direction D. he begins to lift off the stool in a vertical direction E. he falls off the stool
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Quiz Question 3 Compared to main sequence stars, protostars are: A. Fainter and bluer B. Fainter and redder C. Brighter and bluer D. Brighter and redder E. They cannot be compared, since they are not yet real stars
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Extremes of Star Formation 1 Mass too small core never heats enough to
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Lecture07 - Astro Nova February 12 1809 Birthdays Darwin &...

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