space-themed event banner, celebrate ufo world day with an elegant banner showcasing a ufo spacecraft gliding

themed event banner celebrate ufo world day elegant design showcasing spacecraft gliding peacefully starry celestial backdrop deep blue canvas celebration extraterrestrial craft galaxy cosmos eventual observe object astronomy astronomical sky skies night outerstar ship flying unidentified celebratory astronaut planetarium display astrophysics starlight rocket interstellar revelry solar system orbiter ai generated