20th Century Fox l Summit Entertainment
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Between the weird gravity and the constant threat of aliens, Hollywood's version of the final frontier is a decidedly R-rated place. But don't tell these precocious kids. They may not be old enough to drive — let alone pilot a fighter jet or battle bitey monsters — but their heroics make them some of movie and television's most memorable superstars. Here, we celebrate these kids of fictional space and the (literally) small steps they took for mankind.