Lecture 23

Lecture 23 - Today (Weds.) in Astro 3 Cell phones on...

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Today (Weds.) in Today (Weds.) in Astro Astro 3 3 z Cell phones on vibrate… z The Plan: Í Today: Chapter 14 “The Milky Way Galaxy” Í Office hrs. 2:30-4 today Í Tonight 7 p.m.: planetarium observing extra credit Í If next week, can do Weds. and hand in by Friday.
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Perspective on today’s class Going from the “familiar” to the “extreme”: 9 We’ve learned about our own place in the universe 9 We’ve learned about our own solar system (13 light-hours to Pluto) 9 We’ve learned about different types of stars (4 light-years to the nearest) 9 We’ve learned about how stars are born and die, nebulas 9 We’ve learned about really weird “compact” objects (neutron stars, black holes,…)
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Now it’s time to examine the BIG picture Our galaxy is about 100,000 light years across, contains 200 billion stars) – Chapter 14, today Other normal galaxies (2 million light-years to the nearest, Andromeda) Dark matter that surrounds galaxies The entire universe (14,000 million light- years in radius) and its birth and ultimate end
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Units of Chapter 14 Our Parent Galaxy Measuring the Milky Way Galactic Structure The Formation of the Milky Way Galactic Spiral Arms The Mass of the Milky Way Galaxy The Galactic Center
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14.1 Our Parent Galaxy Upper picture: We see few stars when looking out of galaxy (red arrows), many when looking in (blue and white arrows). Lower picture: how our Milky Way galaxy appears in the night sky (b).
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Our galaxy is a spiral galaxy. Two other spiral galaxies that are thought to
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This note was uploaded on 04/16/2008 for the course ASTR 3 taught by Professor Hauser during the Fall '07 term at UCLA.

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Lecture 23 - Today (Weds.) in Astro 3 Cell phones on...

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