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# Mobile Stars: The Apparent Movement of Stars (page 2)

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Author: Janice VanCleave

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1. How does the distance of a star from the Earth affect its parallax distance? Show how the parallax distance of stars at different distances from the Earth can be compared. Repeat the experiment three times, with the star at 5 cm, 10 cm, and 25 cm from the edge of the paper nearest your eyes. Mark these locations along the line on the paper. Without moving your head during the experiment, have a helper put the star on the 5-cm mark. Sight the star, then have your helper record the measurements and move the star to the 10-cm mark. Sight the star as before, then repeat for the 25-cm mark. Science Fair Hint: Use diagrams of each measurement, like the one in Figure 6.2, to compare the parallax distances of stars at different distances from the Earth.
2. How does the length of the baseline affect the parallax distance? Repeat the experiment, first looking at the star with your right eye from the right corner of the paper next to table's edge. Then look at the star with your left eye from the left corner of the paper. Compare the parallax distance in this experiment with that of the original experiment.