Now use your ruler or tape measure to measure the size of the core of the galaxy—that is the yellow region that looks sort of like a flattened donut in the middle of the galactic disk. For this part o...Now use your ruler or tape measure to measure the size of the core of the galaxy—that is the yellow region that looks sort of like a flattened donut in the middle of the galactic disk. For this part of the activity, you can assume that the distance to the screen is the length of your arm. (Hint: This will work better if you keep your shoulder pulled back so it is aligned with your head and not stretched out in front of your body.
