Evidence of the Big Bang
Evidence of the Big Bang Astr 1010-100
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This 2 page Class Notes was uploaded by Alyssa Karounos on Friday March 13, 2015. The Class Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 181 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.
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Date Created: 03/13/15
32 15 1 Goals A Describe evidence for the big bang model beyond expansion of the universe 11 What two major discoveries led to the knowledge of the Big Bang A the Cephiod periodluminosity relationship 1 to tell distance B almost all the galaxies are redshifted 1 moving away from us C These lead directly to the two aces as the hubble plot III Homogeneous and Isotropic expansion A we do not believe that the galaxies are streaking away from us B we believe we are not in a special place or time C if you stretch something uniformly the objects on top will move away from the center and each other C father ones seem to be moving away faster E universe in three dimensions it s spacetime is expanding 1 it s actually four dimensions F because time stretches too it implies that nothing was there before the big bang because the big bang created time G we know that mass bends spacetime H there is no outside the universe because pasae was created then There are no boundaries 1 we have to know what it looks like from the insides IV Topology A mass density of the universe determines its topology Q is ratio of actual density to XXX density B Closed 1 almost a sphere if wrapped onto a sphere the geometry rules would be bent where spacetimes is XXX so that it is closed and not infinite 59 if we are closed there is so much mass that it is closed off and the universe would eventually collapse 5 no boundaries but not infinite and with a set volume 6 Q 2 1 l saddle shape 2 curves in two different directions 3 it will expand infinitely 4 Q S 1 D V B C 53 QZZrW HF Flat even geometry asymptotically expand but slow down it appears we are in a at universe where we are bP NE just the right amount of matter 5 Q 1 Before the Big Bang A imagine what the universe was like 14 billion years ago we imagine that the laws of physics still holds but everything else will be different 1 density so much empty space now 2 temperature universe is like a gas and when compressed temperature goes up when the universe was young all the matter that would form galaXies was more like the inside of a star than like space the inside of a star is ionizes the electrons are unbanned from atoms which makes this an opaque plasma light has no way to go through a sheet of electrons Universe was like a star 1 hot and dense 2 glowed like the surface of a star Beginning was so hot it ionized everything opaque expansion cooling electrons lose energy and aren t bouncing all the time then we create atoms and the universe is transparent creates photons and is glowing all the giving of light starts traveling the photons should still be around and hitting the universe What spectra would the first photons be 1 continuous 2 redshifted of course 3 and it would peak at microwaves
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