majestic cosmic background with purple nebula and stars, ideal for spacethemed s, posters, and prints

cosmic background purple nebula stars space universe majestic celestial galaxy astronomy night sky cosmos deep vast infinite starlight ethereal outer astrophotography digital wallpaper design poster print spacethemed dark constellation heavenly formation interstellar misty cloud tranquil serene atmosphere mystical dreamy infinity light aweinspiring galactic mystery artistic science exploration backdrop distant wonder astrophysical ai generated