What is dark matter?

This is not the place for a full discussion of this topic but if you are convinced that at least 50% of the mass of our galaxy is invisible, we have a bit of a problem - after all, our galaxy is nothing special and what is true of our galaxy is probably true of the universe as a whole.

Possible candidates for dark matter include:

and lastly, and controversially The trouble is that evidence for any of these is distinctly lacking.

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