ULC Ukrainian Center for Education, 2011. Astronomy is the science of the motion, structure and development of celestial bodies and their systems, up to the Universe as a whole. In particular, astronomy studies the Sun, the planets of the solar system and their satellites, asteroids, comets, meteorites, interplanetary matter, stars and extrasolar planets (exoplanets), nebulae, interstellar matter, galaxies and their clusters, pulsars, quasars, black holes and much more. This is a modern multimedia encyclopedia developed in accordance with the requirements of the modern standard of secondary education as an individual tutor and aimed at helping students to obtain additional knowledge from the school curriculum.