'Star Wars' Science: How Would BB-8 Work?

The real star of the upcoming "Star Wars" movie may not be a human or a Wookie. Instead, it may be a round, 2-foot-tall astromech droid named BB-8.

It may look great on the screen, but could BB-8 exist in real life?

Associate professor Wolfgang Fink would know, as an expert in artificially intelligent Mars rovers — and as an unabashed "Star Wars" fan.

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