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Lecture 3

AST101H5 Lecture 3: 20160912

Course Code
John Lester

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AST101H5 20160912
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Victoria W.
Last Week
Chapter one Our Place in the universe
-How do we know the properties of Earth?
-What is the solar system, what are its properties?
-Number: methods, meaning, implications
-Numbers: directly, rations, scientific notation, new units=AU
-Solar system goes out to half way to the nearest star  
Comic calculation
-volume of the solar system = 
-    
  
 
-suppose each cubic meter has 1 g of dust
 
  
=2,000,000,000,000,000,000,000 Earths
-Conclusion: space is so huge that even enormous masses are hard to detect
Chapter 2: Discovering the Sky
What are constellations?
-Patterns of stars we see in the sky
-Stars in a cancellation may not be associated with each other in space they may just
appear grouped together as seen from earth
(Appendix H on p. A19-20 and appendix I on p.A21-25 give sky charts)
-In AST101 we use the stars only as a fixed background to detect the movement of objects in
the solar system
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