AaS! 179: What are the Alternatives to Dark Matter?

What are some of the problems with dark matter? What about modified gravity? Are there any other solutions? I discuss these questions and more in today's Ask a Spaceman!

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Thanks to Cathy Rinella for editing.

Hosted by Paul M. Sutter, astrophysicist and the one and only Agent to the Stars (http://www.pmsutter.com).