Much of the mass in galaxies and clusters of galaxies is dark matter.All of the techniques below are means of detecting evidence of this dark matter EXCEPT ONE.Which is the exception?
A) measuring the speed of stars in their orbits around a galactic center
B) gravitational lensing of very distant galaxies by a nearby galaxy (or cluster) and its accompanying dark matter
C) observing the aftermath of a collision such as that in galaxy cluster 1E0657-56
D) observing X rays being emitted from the space between galaxies in rich clusters
Correct Answer:
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A) Distant superclusters
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