Making the Diagram
Explore 6: Use a graphing program such as Microsoft
Excel or Graphical Analysis to make a Hubble diagram for the six galaxies you studied in
Explore 4 and 5. Put magnitude on the xaxis and redshift on the yaxis. What does your diagram look like?
For help with Excel, see SkyServer's
Graphing and Analyzing Data tutorial.

The points in your diagram should roughly connect to form a straight line. If you want to
quantify how close your graph is to being a straight line, see how to
add a trendline
to your Hubble diagram.
Question 3. Compare your Hubble diagram to the diagram you made for the dots on an expanding balloon. How are they similar? How are they different? Based on the graphs, do you think an expanding balloon is a good model for the real universe?

Click Next to learn how to interpret your Hubble diagram.
