Lecture 22

Lecture 22 - Cosmology: Creation and Fate of the Universe...

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Cosmology: Creation and Fate of the Universe Thursday, April 29, 2010 1:42 PM 1. Why is the light from distant galaxies red-shifted? o The space between us and a distant galaxy is expanding, stretching the light waves as they travel towards us o Light from distant galaxies has had to travel farther, so it has lost more energy along the way 2. Einstein's Greatest Blunder? o Until Hubble astronomers believed the universe was… Static Eternal Infinite o The equations of the universe In 1915 Einstein tried to apply general relativity to the universe It could not be static It must be either expanding or contracting Einstein solved this by introducing a cosmic repulsion, the Cosmological Constant o A missed oppurtunity Einstein could have predicted the expansion of the universe 10 yrs later Hubble discovered it by observing galaxies "the greatest blunder of my life"- Einstein 3. Distance, Time, and Redshift o The meaning of an expanding universe Not really a Doppler shift
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This note was uploaded on 03/30/2012 for the course ASTR 1102 taught by Professor Staff during the Spring '08 term at LSU.

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Lecture 22 - Cosmology: Creation and Fate of the Universe...

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