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Lec23 - MidTerm2 Results Avg Score = 74.1 Median score = 74...

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MidTerm2 Results Avg. Score = 74.1 Median score = 74 Standard deviation = 10.7 (vs. 13.3 for MT2) F D D D C C C B B B A A 2 4 6 8 10 12
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D C A D is an “Open” or “Galactic” cluster A,B,C are “Globular clusters”
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Upcoming assignment For Wed. Nov. 9 Read Ch. 19 + Do Online Quiz 08
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19. Our Galaxy Immanuel Kant (1724 – 1804) German philosopher The infinitude of creation is great enough to make a world, or a Milky Way of worlds, look in comparison with it what a flower or an insect does in comparison with the Earth.
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Regions of the Milky Way Galaxy diameter of disk = 100,000 l.y. (30,000 pc) number of stars = 200 billion thickness of disk = 1,000 l.y. (300 pc) Sun is in disk, 28,000 l.y. out from center play brf
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Galaxy Song - Composers: Eric Idle & John Du Prez Author: Eric Idle Singer: Eric Idle From the 'Meaning of Life' Just remember that you're standing on a planet that's evolving And revolving at nine hundred miles an hour, That's orbiting at nineteen miles a second, so it's reckoned, A sun that is the source of all our power. The sun and you and me and all the stars that we can see Are moving at a million miles a day In an outer spiral arm, at forty thousand miles an hour, Of the galaxy we call the 'Milky Way'. Our galaxy itself contains a hundred billion stars. It's a hundred thousand light years side to side. It bulges in the middle, sixteen thousand light years thick, But out by us, it's just three thousand light years wide.
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