1. Why is it difficult to specify the dimensions of the disk and halo? 2. Why didn’t astronomers… 1 answer below »

1. Why is it difficult to specify the dimensions of the disk and halo? 2. Why didn’t astronomers before Shapley realize how large the galaxy is? 3. What evidence can you cite that our galaxy has a galactic corona? 4. Contrast the motion of the disk stars and that of the halo stars. Why do their orbits differ?  

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