Evolution of the Atmosphere
Where did the earth's
atmosphere come from? How did the earth's atmosphere evolve to the present state? How do we know our `story' is correct?
Where did our atmosphere come from?
What? Isn't the
atmosphere here all
The Physical and Chemical Structure of the Atmosphere
Transparent but complicated!
Composition of the Atmosphere
Permanent Constituents (residence time ~10 millions of years) ~ 78% of nitrogen (N2) ~ 21% of oxygen (O2) ~ 1% of argon (A) ~0.034% of
Milky Way Galaxy-1
Milk? Vapor? Stars? Dusts?
A Typical Galaxy
M31 in Andromeda-our neighbor galaxy (~ 2.3 M light years away)
Our own Milky Way Galaxy
NASA computerrendered image from observational data
How many galaxies
AOS 121 Fall 2007 Environment and Society
Cross-listed with IES and Geography
Review for the 1st midterm exam
1st midterm: Wednesday (Oct. 3, in class) Exam time is 1:20pm~2:10pm (50 minutes) Closed book exam 30~40 multiple choice qu