Question 1 Directions
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• On the STARS tab, check that Region A: NGC 224 (Andromeda
Galaxy) is selected. If not, click Return to map and select Region A.
Locate and select the white Cepheid variable star (A-171) in the
upper right section of the Andromeda Galaxy.
• Click the Collect data button. You will see a graph of the apparent
brightness of the star over time.
. Click Show time probes and match up the sliders with two
consecutive peaks. This will help you determine the Period by
subtracting the lowest time from the highest time.
What is the average period of star A-171? Choose the answer that
most closely matches your measured value.
Select one:
a. 6 days
b. 8 days
c. 2 days
d. 4 days