ufos, flying saucer, sundog, epsilon aurigae, ornithopter, zodiacal light, microlight, sparrowhawk, ufologist, hawk moth, meteor, aerodrome, bolide, rusty blackbird, gyrocopter, meteoroid, celestial sphere, hang glider, twitcher, waxwing, asterism, turkey buzzard, bermuda triangle, helldiver, godwit, jaegers, contrail, piltdown, daddy longlegs, planetoid, spitzbergen, phalarope, omega centauri, noctilucent, pareidolia, extraterrestrial, apparition, ozone hole, airship, skua, kingfisher, microlite, mesosphere, ocean sunfish, sparrow hawk, basking shark, richthofen, annular eclipse, redpoll, wandering albatross, belted kingfisher, aurorae, sighting, orb, tiger moth, telescopically, edmond halley, earthwards, waterspout, doodlebug, elephant shrew, thunderhead, horsehead nebula, glaucous gull, taurid, sea gull, meteor shower, spy satellite, oarfish, snowy owl, northern harrier, autogyro, aeronaut, airfield, andromeda galaxy, stargazer, frogspawn, earwig, fred hoyle, vader, asteroid, mayfly, tawny owl, avocet, dragonfly, autogiro, redheaded woodpecker, noosphere, bluebottle, identikit picture, jodrell bank, hummingbird moth, psychic phenomena, beachy head, magnetic monopole, triangulum, hawk owl, sky, tufted puffin, antarctic, optical illusion, blackburnian warbler

apparition, phantom, shadow

flying saucer, ufo