an astronaut (member of the crew of a spaceship or other spacecraft, or someone trained for that purpose)

space flight

a pilot (person in charge of the controls of an aircraft)

imagine / guess, suppose

imagination / guess, suppose

oneself / first-person pronoun: I, me (often shows the speaker's lower position in a hierarchy than the addressee) / (Kansai) you

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

to fly

he; boyfriend

flying; flight