Modern Astronomy, Its Rise and Progress

absolute magnitude announced appear asteroids believed binary bodies canals catalogue Cepheid close clouds cometary comets conclusion confirmed dark detected diameter disc discovered discovery distance dwarfs Earth eclipse Eddington evidence existence fact faint galactic plane galactic system Galaxy Galileo gaseous giant planets giant stars globular clusters Herschel Huggins hypothesis indicated investigation Jupiter Kapteyn known Laplace Lick Observatory light light-years Lowell Lowell Observatory luminosity lunar Mädler Mars Martian mass Max Wolf measured meteors miles Milky million Moon Mount Wilson Mount Wilson Observatory nebulosity Nova objects observations orbit parallax particles period photographic photosphere planetary nebulae Professor prominences proper motions radiation regions remarked result ring rotation satellites Saturn Schiaparelli selenography Shapley sidereal system Slipher solar atmosphere Solar System spectra spectroscopic spectrum spiral nebulae spots stellar system sun-spot Sun's surface telescope temperature temporary stars theory tion Uranus variable velocity W. H. Pickering