Space ships 7 Exploration 6 Science and civilization 6 Scott, Montgomery (Fictitious character) 6 Space flight 6 Sulu, Hikaru (Fictitious character) 6 Interplanetary voyages 5 more ... McCoy, Leonard (Fictitious character) 5 Exploration of outer space 3 Kirk, James T. (Fictitious character) 3 Spock (Fictitious character) 3 Human-alien encounters 1 less ...