112lect2 - GY 112 Lecture Notes D. Haywick (2006) 1 GY 112...

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GY 112 Lecture Notes D. Haywick (2006) 1 GY 112 Lecture Notes Origin of the Universe & Solar System Lecture Goals: A) Discuss theoretical age of Universe B) Outline the “Big Bang Theory” C) Sol as a second generation star D) The solar system Textbook reference: Levin 7 th edition (2003), Chapter 6 ; Levin 8 th edition (2006), Chapter 8 A) The Age of the Universe Only a few years ago, scientists could not agree upon the age of the Universe. The best they could do, was guess that it was between 12 and 18 billion years old (12-18 Ga ). This age was determined on the basis of the most distant objects in the known Universe. These objects (usually quasars) are up to 12 billion light years away from the Earth and moving at great speeds away from the Earth. If we assume that they are on the leading edge of the Universe, and that the Universe was generated through a sudden “explosion”, scientists felt that the Universe must be at least 12 billion years old. More recent research has narrowed the age of the universe significantly. It is now believed to be 13.7 billion years old. You are probably asking how do we know this? Well the best explanation is provided on the Astronomy Picture of the Day Web site (http://antwrp.gsfc.nasa.gov). This is taken verbatim from them: “Analyses of a new high-resolution map of microwave light emitted only 380,000 years after the Big Bang appear to define our universe more precisely than ever before. The eagerly awaited results from the orbiting Wilkinson Microwave Anisotropy Probe resolve several long-standing disagreements in cosmology rooted in less precise data. Specifically, present analyses of above WMAP all-sky image indicate that the universe is 13.7 billion years old (accurate to 1 percent), composed of 73 percent dark energy, 23 percent cold dark matter, and only 4 percent atoms, is currently expanding at the rate of 71 km/sec/Mpc (accurate to 5 percent), underwent episodes of rapid expansion called inflation, and will expand forever. Astronomers will likely research the foundations and implications of these results for years to come” Useful info: Currently, there is a website with chapter summaries, quizzes and other useful info pertaining to the text book indicated above. You might want to visit the page if you need additional material for the class. The only glitch is that this website is for the 7 th edition of the textbook, so the chapters referenced for the 2003 (7 th edition) do not agree with the 2006 (8 th edition). I have put a hyperlink on the 2003 chapter references. In the event that your Adope pdf reader does not allow you to access the hyperlink, here is the web address for the Student Companion Site (it is also on the GY 112 website): http://bcs.wiley.com/he-bcs/Books?action=contents&itemId=0470000201&bcsId=1365
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GY 112 Lecture Notes D. Haywick (2006) 2 The image that they are referring to appears below. You can consider it to be a self portrait of the baby universe approximately 13.3 billion years ago.
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This note was uploaded on 02/04/2012 for the course GLY 112 taught by Professor Haywick during the Spring '12 term at S. Alabama.

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112lect2 - GY 112 Lecture Notes D. Haywick (2006) 1 GY 112...

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