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How do scientists know that dark matter exists? A. Clusters that cannibalize each other B. Nuclear Bulges C. Redshifts D. Gravitational lensing.
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How do scientists know that dark matter exists? A. Clusters that cannibalize each other B. Nuclear Bulges C. Redshifts D. Gravitational lensing.

User Daniel Dropik
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Not 100% sure but I'm pretty sure the answer is D.
User Ncomputers
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D. Gravitational lensing.

This means that the light is bending as the light travels from the source to the observer, and if there are any 'holes' in between the beam, that is where 'dark matter' exists


hope this helps
User Bert Jan Schrijver
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