The expanding bubble of hot gas inflated by the cluster of new stars in its center, show...
The expanding bubble of hot gas inflated by the cluster of new stars in its center, shown in Figure 14-7a, has a diameter of about 70 ly. If the bubble is 170,000 ly from Earth, what is the observed diameter of the bubble in arc seconds? (Hint: Use the small-angle formula, Chapter 3.)
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