1. Carefully locate the pulsar. Circle it on both pictures. 2. Calculate the time interval between the 2 images in years: t= 27 years 3. You'll need the length scale for each image. Note that there are two stars marked in both the 1973 and 2000 images. Measure the distance on each image between the two marked stars in millimeters, estimating to the nearest 0.1mm. Record the values in table 1. Given that stars don't move significantly in a few decades, why would the distance be different in the two images? Give at least 2 reasons