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Spring 2008  Astr 10  4/29  Lecture 4.3  
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"We had the sky up there, all speckled with stars,
and we used to lay on our backs and look up at 
them and discuss about whether they were made or 
only just happened."
--Samuel Clemens (Mark Twain)

TODAY: INTERSTELLAR MATTER
Quiz 10: 1:00-1:15 PM
     **NO CELL PHONES/MEDIA PLAYERS/PDAS ALLOWED**
     USE YOUR OWN UNIQUE 4-DIGIT P.I.N.
Interstellar matter
     Stars and nebulae (*.mov, 2.3 MB)
     (SpaceTelescope.org)
NASA Astronomy Pictures of the Day
     [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12]
PlanetQuest 3D Guide to the Galaxy (*.js, 1.3 MB)
     (jpl.nasa.gov)
In-class activity 26 (*.pdf)
     Find and sit in your assigned groups
     Turn in group worksheet
Milky Way structure
Figs. 22.28, 22.23, 22.26 (*.gif)
     (Fix, _Astronomy: Journey to the Cosmic Frontier_, 4/e)