Example image of eyePlorer eyePlorer map for 'Andromeda Galaxy': Andromeda (constellation) Nebula Spiral galaxy Milky Way Naked eye Andromeda (mythology) Greek mythology Galaxy Local Group Triangulum Galaxy Dark matter Spitzer Space Telescope Solar mass Apparent magnitude Light pollution Messier object Abd al-Rahman al-Sufi Astronomy in medieval Islam Book of Fixed Stars Common Era Star chart Simon Marius Charles Messier William Herschel Sirius Spectrum William Huggins Continuum Frequency Spectral line S Andromedae Supernova Nova Isaac Roberts Sussex Lowell Observatory Radial velocity Solar System Spectroscopy Vesto Slipher Heber Doust Curtis Magnitude (astronomy) Harlow Shapley The Great Debate Universe Doppler effect Ernst Öpik Cepheid variable Edwin Hubble Mount Wilson Observatory