spaceship, unidentified flying object, dirigible, ornithopter, balloon, meteor, pterodactyl, extraterrestrial, meteorite, hang glider, outer space, geodesic dome, glider, stealth bomber, jetsons, airship, ufo, airplane, aliens, orb, tinkertoy, lunar excursion module, bigfoot, mushroom cloud, blimp, whirlybirds, rocketeer, contraption, loch ness monster, zeppelin, biplane, ballon, bermuda triangle, dragonfly, tunguska, asteroid, wormhole, gnome, autogyro, sundog, doodlebug, megaton bomb, martians, retroreflector, plane, missle, tribble, autogiro, ferris wheel, turkey buzzard, mockup, fireball, zoetrope, spacecraft, spaceward, cow pasture, hindenburg, daddy longlegs, buckminster fuller, tardis, zodiacal light, sasquatch, meteoroid, comet, bolide, noosphere, microlight, mythical creature, futuristic, sputnik, antigravity, saucer, buzzards, geodesic, tyrannosaurus rex, pilotless, cumulus cloud, sailplane, gyrocopter, sonic boom, ufologist, graf zeppelin, blob, seahawk, copter, hoax, horsehead nebula, uav, velociraptor, space capsule, luna moth, vader, aerostat, propeller plane, lunar module, sea serpent, creature, louis bleriot, pirate ship, apparition, pteranodon, thunderbirds

apparition, phantom, shadow

ufo, unidentified flying object