Definition of Astronomy Astronomy is a branch of science which deals with the study of position, composition, motion and other related facts of heavenly bodies. The universe It is the limitless expanse of space around us consisting of solar system, stars, galaxies etc. Main constituent of universe are: (a) Solar system (b) Stars (c) Galaxies . Solar System 1) It is the name given to the family of sun and is part of the universe in which we live. 2) The sun is situated at the central position of the solar system around which nine planets revolve in elliptical orbits along with some other heavenly bodies. 3) The various planets of solar system in the order of increasing distance from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. The order of planate can be recollected by the phase ?My Very Educated Mother Just Served Us Nine Pizzas?. The first later of each word gives the name of the planate. 4) The velocity of ...
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