Ключевые слова: aerial, astronomy, atmosphere, backdrop, background, black, blue, city, communication, concepts, dark, earth, east, effect, global, globe, glow, graphic, ideas, illustration, image, land, light, map, middle, morning, nature, network, networking, night, planet, science, shadow, shape, sky, solar, space, sphere, star, sun, sunlight, surface, system, view, world,