Can a moon have a moon?

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.