Unidentified flying object synonyms

What is another word for Unidentified flying object?

• flying saucer

  unknown flying object
• ufo
• spacecraft

  unknown flying object
• spaceship

  unknown flying object
• extraterrestrial spacecraft

  unknown flying object
• shuttle
• space capsule
• rocket
• space probe
• satellite
• space shuttle
• rocket ship
• extraterrestrial vessel
• alien spacecraft
• alien spaceship
• space station
• spacelab
• ship
• space rocket
• alien craft
• flying disk
• flying flapjack
• foo fighter
• apparition
• fantasm
• phantasm
• phantasma
• phantom
• shadow