Astronomy is a science dicipline that studies comets, planets and orbital celestial bodies in physical and chemical way. The word astronomy consists of the words astron and nomes and means “Law of the Stars”. Subjects of Astronomy Birth of the stars Meteor, meteroids, asteroids, planets, satellites Nucleosynthesis:”Nucleosynthesis, daha önceden varolan çekirdek parçacıklarından, esasen proton ve nötronlardan, yeni atomik çekirdeklerin oluşturulması sürecidir.” Celestial Mechanics Constellations Quasars Blackholes Astrometry: Calculation of star’s and celestial body’s locations.