A couple of notes about how to use the software. The little cross in the tools window is for centering the cursor on the stars. The images are made up of pixels i.e. picture elements which register the intensity of light. I suggest that you magnify one of the images many times until you start to see indiviual pixels. As you move the cursor around you will see different values in the Info box.
Higher numbers mean brighter pixels.
Answer the questions at the end of the lab and turn in by the due date. Meet in the lobby of B building at 700 pm sharp. If it is raining or cloudy we will meet on Mar. 11 instead. This lab is on the internet. Determining the Extragalactic Distance Scale and Click on it Examine the Table of Contents.