Multiple Choice
What observations suggest the mass of the Galaxy goes much farther out than its visible disc?
A) the rotation curve of the outermost portions of the disc
B) infrared observations of distant brown dwarfs
C) the orbits of the open clusters in the disc
D) 21- cm maps of the spiral arms
E) X- ray images of other galaxies' discs from Chandra
Correct Answer:
Verified
Correct Answer:
Verified
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