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How do astronomers know that dark matter exists? A. Because it emits electromagnetic radiation B. Because it can be directly observed C. Because its gravity affects the motion of objects around it D. None
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How do astronomers know that dark matter exists?

A. Because it emits electromagnetic radiation
B. Because it can be directly observed
C. Because its gravity affects the motion of objects around it
D. None of the above

User David Van Driessche
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Answer:

C. Because it's gravity affects the motion of objects around it.

User Sebdalgarno
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