FinalReview

FinalReview - Final Exam Details Location: Moore 100...

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Final Exam Details Location: Moore 100 (across the street from MS4000A) Time/Date: 11:30am Tuesday, June 7 Don’t be late!!! Multiple choice: 90 questions, 90 minutes Scantrons will be provided Exam is cumulative and will cover all 18 Chapters About 50% of the exam is on the last 6 chapters (last three HWs) Other 50% is on material already covered by previous mid-terms Rules: NO ONE may leave during the first 30 minutes. Only 2 students at a time may approach the Proctors to hand in their Scantron and Test Paper. You must show ID at the Final . Bathroom breaks are at discretion of Proctors; but, no one is allowed to exit and re-enter exam after first 30 minutes.
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Once upon a time in a far Once upon a time in a far off distant universe off distant universe The date: 13.7 billion years ago The place: Everywhere The temperature: 10,000,000,000,00 0,000,000,000,000, 000,000 K ( hot) The event: The Big Bang Bang
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From the Beginning of Time From the Beginning of Time If the universe is infinite then every line of sight contains a star or galaxy, so the sky cannot be black at night, but it is! This is Olber’s paradox. Question the assumptions Universe has a finite age - the time since the Big Bang There is a cosmic horizon given by the distance light can travel in the age of the universe so far (light speed is finite); we cannot see objects beyond that distance The universe is expanding as it ages and this expansion stretches the wavelength of light to the red (light from the most distant objects is redshifted beyond the visible part of the spectrum) So, every line of sight is So, every line of sight is not not filled, and filled, and distant objects are infrared, therefore distant objects are infrared, therefore the sky is dark at night the sky is dark at night In a dense forest every line of sight intercepts a tree; in an infinite universe every line of sight should intercept a star or galaxy
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Not an explosion Not an explosion but the but the expansion of space itself expansion of space itself The surface of the balloon represents all of space. A spherical surface represents a “ closed ” universe Spots of fixed size are like galaxies held together by gravity So much expansion, everything seems “flat” EINSTEIN’S General Theory of Relativity explains gravity as the curvature of four dimensional spacetime
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In the blink of an eye In the blink of an eye As the universe cooled the 4 natural forces began to split apart Gravity went first at the “Planck scale” ~ 10 -43 s When the Strong Nuclear Force split off at ~10 -38 s there was an incredible release of energy that produced a huge INFLATION of space The universe expanded from the size of the nucleus of an atom to the size of the solar system in only 10 -36 seconds; we know laws of physics back to 10 -10 s INFLATION explains the fact that all parts of the universe look the same
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This note was uploaded on 02/20/2012 for the course ASTRO 3 taught by Professor Mclean during the Spring '11 term at UCLA.

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FinalReview - Final Exam Details Location: Moore 100...

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