class31a - Wednesday, Nov. 12 Syllabus, class notes, and...

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Wednesday, Nov. 12 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 13.1, 13.2, 15 The help session this week (only) is in WEL 3.260 at 6:00 on Wednesday. (Note the unusual place and time.) Homework question #1 is confusing. I tried to simplify it some on a revised version. (It is still not easy.) You can do either version.
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Topics for this week How does the big bang theory explain Hubble’s law? How does the big bang theory explain the microwave background radiation? Describe some of the events that occurred in the first few minutes after the big bang. Describe how supernovae are used to measure the rate of expansion of the Universe in the past. Describe how matter and energy cause the expansion of the Universe to accelerate or decelerate. Do we think the Universe is finite or infinite? Do we think the Universe will eventually collapse or expand forever?
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The age of the Universe We can calculate when the big bang occurred by asking how long it would have taken distant galaxies to get to where they are. If different galaxies started out moving away from us faster than others did, and they all started at the same time, the ones moving away faster would have gotten farther by now. If the galaxies’ speeds have not changed we can calculate how long ago they started moving. The time to travel a distance d at speed v is given by
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This note was uploaded on 07/13/2010 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas at Austin.

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class31a - Wednesday, Nov. 12 Syllabus, class notes, and...

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