One of the Most Important Features That Must Be Explained

question 46

Multiple Choice

One of the most important features that must be explained by models during the formation of the galaxy is the ____.

• A) formation of spiral arms
• B) differences in age and metallicity of stars, especially in the halo
• C) formation of the central supermassive black hole
• D) accumulation of dark matter in the corona
• E) importance of spiral arms to star formation