Ключевые слова: academy, alarm, alertness, astronomer, astronomy, background, building, camera, cctv, closeup, concept, control, education, electronic, environment, equipment, forward, galaxy, guard, horizon, industry, lens, looking, nature, observation, observatory, observe, outdoors, people, planetarium, privacy, protect, protection, record, safety, school, science, scientist, secure, security, sky, space, spyglass, surveillance, system, technology, telescope, universe, urban, video,