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
Correct Answer:
Verified
Correct Answer:
Verified
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