INSTRUCTIONS

Assume all of the sample galaxies in the image below are about the same size, so that those that appear smaller are farther away - bigger is closer.

In this exercise your mouse pointer will be your redshift spectroscope.

1. Mouseover the center of each galaxy, waiting each time for the velocity data to "pop up".
2. Measure the width on the screen of each galaxy in centimeters,
   decimal points are ok (e.g. 1.5).
3. Record the values (in any order) in the blanks provided below.
4. Click on the "Tabulate Data" button. Width measurements will be converted to distances.
5. Print the resulting page and follow the final instructions given there.