Can a moon have a moon?

Moment of Um - A podcast by American Public Media

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One of the best things about looking up at the night sky is gazing at our big, beautiful moon. But why do we get to have all the fun? Can a moon have its own moon? Harvard graduate student Chantanelle Nava helps us understand. Do you have a Moment of Um question for us that’s totally far out? Send it to us at BrainsOn.org/contact, and we’ll help you find the answer.