Imagine You Discovered a Barred Spiral Galaxy That Was a "Milky

question 81

Multiple Choice

Imagine you discovered a barred spiral galaxy that was a "Milky Way twin" because of the size of the bulge and disk, the arrangement of the spiral arms, and other characteristics just like those in our galaxy.Then you measured its rotation curve and plotted the data as shown in the figure below.What would you conclude about this galaxy?

• A) This galaxy has much more dark matter than does the Milky Way.
• B) This galaxy has about the same amount of dark matter as does the Milky Way.
• C) This galaxy inexplicably has much less dark matter than does the Milky Way.
• D) This galaxy probably has no stellar halo.
• E) This galaxy probably has no central black hole.

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