Space ships Interplanetary voyages 21 Space flight 14 Human-alien encounters 12 Exploration 11 Vaisseaux spatiaux 9 Exploration of outer space 8 more ... Science and civilization 7 Space colonies 6 Space warfare 6 McCoy, Leonard (Fictitious character) 5 Robots 5 Scott, Montgomery (Fictitious character) 5 Sulu, Hikaru (Fictitious character) 5 Interstellar travel 4 Enemies 3 Enterprise (Imaginary space vehicle) 3 Friendship 3 Kirk, James T. (Fictitious character) 3 Life on other planets 3 Rencontres avec les extraterrestres 3 Spock (Fictitious character) 3 War 3 Astronauts 2 Astronaves 2 Closed caption video recordings 2 Extraterrestrial beings 2 Introduced organisms 2 Manned space flight 2 Perseveration (Psychology) 2 less ...