AST201_winter2010_mreid_slideset2_Bb_dark_version

AST201_winter2010_mreid_slideset2_Bb_dark_version -...

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1/6/2010 1 AST 201 Stars and Galaxies 1 AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid The Universe AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 2 Last class, we discussed the general layout and enormous size of the Universe. Let’s get a little more quantitative in our description. AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 3 First, what is the Universe? How would you define it? AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 4
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1/6/2010 2 The Universe is the totality of all space, time, energy, and matter. It’s everything. It has no outside. AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 5 How old is the Universe? For now, accept that it is 13.7 billion years old. We’ll come back later and explain how we know this. AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 6 How big is the Universe? We have to be careful: the whole Universe may be infinite in size, but there is a physical limit to how much of it we can see. Why? AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 7 Remember, light travels at a fixed speed in a vacuum: AST 201, Winter 2010, University of Toronto, Dr. M. A. Reid 8 speed of light = c = 300 million m/s
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1/6/2010 3 Because distances in astronomy are huge, we need new units to describe them. A
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This note was uploaded on 03/02/2010 for the course AST AST201 taught by Professor Mochnacki during the Spring '10 term at University of Toronto- Toronto.

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AST201_winter2010_mreid_slideset2_Bb_dark_version -...

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