What Observations Suggest the Mass of the Galaxy Goes Much

question 30

Multiple Choice

What observations suggest the mass of the Galaxy goes much farther out than its visibledisk?

• A)21 cm maps of the spiral arms
• B)the rotation curve of the outermost portions of the disk
• C)the orbits of the open clusters in the disk
• D)infrared observations of distant brown dwarfs
• E)X-ray images of other galaxies' disks from Chandra

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