Astronomers believe that dark matter exists because.
A) they can detect it with radio telescopes.
B) the outer parts of galaxies rotate faster than expected on the basis of the material visible in them.
C) the galaxies in clusters move slower than expected on the basis of the material visible in them.
D) it is the only way to explain the black holes in active galaxies.
E) All of these choices are correct.

Question

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The Answer of Astronomers believe that dark matter exists because.
A) they can detect it with radio telescopes.
B) the outer parts of galaxies rotate faster than expected on the basis of the material visible in them.
C) the galaxies in clusters move slower than expected on the basis of the material visible in them.
D) it is the only way to explain the black holes in active galaxies.
E) All of these choices are correct.

Astronomers Believe That Dark Matter Exists Because