Multiple Choice
What evidence do we have that galaxies have extended haloes of dark matter?
A) Orbital speed doesn't fall off in the outer parts of galaxies
B) The outer parts of galaxies are intense infrared sources
C) Light from background galaxies is blocked by the dark matter
D) The orbits of distant globular clusters are distorted by the dark matter
Correct Answer:
Verified
Correct Answer:
Verified
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