ASTR220 Hamilton 
		    Homework #4 (12 points)
        due Wednesday May 6 at the beginning of class 

1. [2pts.] Choose an example from the first 8 chapters in Colliding
Galaxies to illustrate the premise that development of a new
technology, instrument, or new observational technique generally leads
to an expansion of astronomical knowledge.

2. [3pts.] Compare Shapley's view of the universe to Curtis's view of
the universe.  Which view turned out to be correct and when was this
debate resolved?

3. [3pts.] Describe the model(s) used to account for the observations
made of quasars and active galaxies.

4. [2pts.] What evidence supports the hypothesis that the Milky Way
has a supermassive black hole at its core?

5. [2pts.] You see two red stars, a dwarf and a giant, that appear
equally bright from Earth. One is really 10000 times more luminous
than the other, though. Which star is more luminous, and how much
further away must it be so that the stars appear equally bright from
Earth? Go back to the "Working with Equations" webpage and practice
some problems like this until you are sure that you are able to do
them. Come see Nathaniel or me if you have difficulties. There will be
a question like this on the Final!

Extra Credit Problem:
Go to ASTR220 webpage for this assignment.