What Evidence Tells Us That at Least Some Dark Matter

question 44

Multiple Choice

What evidence tells us that at least some dark matter consists of objects made of ordinary matter that orbit in the halo of the galaxy?

• A) We have detected gravitational lensing of distant objects that appears to be caused by unseen objects in the halo of our galaxy.
• B) Radio observations have detected numerous such objects in the galactic halo.
• C) Powerful new telescopes can see even the dimmest objects in the halo.
• D) The rotation curve of the Milky Way Galaxy shows that some dark matter must be ordinary.

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