Lecture_2_Big_Bang - https:/t-square.gatech.edu/portal 1 To...

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1 1 https: //t-square . gatech . edu/portal 2 To setup your clicker 1. Turn on clicker 2. Press * to display setup menu 3. Scroll using up/down arrows to display ID 4. Press green arrow 5. Input your student ID 6. Press green arrow to save ID The device will remember your ID-- you only have to do this once!
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2 3 To join the PRS class • Turn on your clicker • It will scan the channels • Use arrows to choose LYNCH-2008 • You can also press channel number (Inside <>) to join immediately instead of waiting for scan 4 To answer a question • Enter your answer • Press green arrow • Enter and press again if you change your mind • Clicker will indicate that your answer was received
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3 5 Can you get your PRS to work? 1. Yes 2. No 3. I don’t have it yet 6 Dark Sky Paradox Proposed by Heinrich Olbers in 1826 • If Universe is infinite and at steady state, the sky should be light everywhere Graphic: U. of Arizona
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4 7 Dark Sky Paradox • If there is dark matter in between, it would eventually heat up and emit it’s own light 8 Dark Sky Paradox • If Universe is finite it should collapse Galaxies on “edge” feel inward tug of gravity
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5 9 Solution Proposed by George LeMaitre 1927 • Universe is not infinite • Universe is not static but expanding - “exploding egg” • 1929 Edwin Hubble demonstrated that all galaxies appear to be traveling away from ours 10 Hubble also discovered that the farther the galaxy, the more rapidly it receded and that the distance and recession velocity were linearly related (v = H o L, H o = Hubble constant)
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6 11 Car 1 30 mph Car 2 60 mph 15 mi 45 mi Car 3 90 mph 30 mi I have the Criminals! I haven’t seen any
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This note was uploaded on 02/08/2011 for the course EAS 1601 taught by Professor Lynch during the Spring '08 term at Georgia Institute of Technology.

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Lecture_2_Big_Bang - https:/t-square.gatech.edu/portal 1 To...

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