Related by context. Frequent words. (Click for all words.) 51 Pleiades 50 Arcturus 49 constellations 47 Milky Way 47 Cassiopeia 46 nebula 45 Dipper 45 Spica 45 dipper 43 constellation 42 crescent moon 40 nebulae 40 celestial bodies 40 planets 39 Halley Comet 39 Aldebaran 39 Cygnus 37 crescent 37 Sagittarius 37 Stargazers 37 orb 37 Milky Way galaxy 37 equator 37 aurora borealis 37 hexagon 37 Uranus 36 Planets 36 galaxy 36 sky 36 moons 36 planet orbiting 36 reflector 36 galaxies 35 Sedna 35 Kuiper Belt 35 Teapot 35 supernova 35 Moon 35 Perseids 35 telescope 35 Pluto 35 Saturn rings 35 extrasolar planets 35 meteor shower 35 astronomers 35 celestial 35 planetarium 35 Full Moon 35 ellipse 34 aurora 34 Galaxies 34 brown dwarf 34 conical 34 orbits 34 summer solstice 34 Very Large Telescope 34 starlight 34 comet 34 neutron star 33 zodiac 33 celestial objects 33 exoplanets 33 Solar System 33 planets orbiting 33 Astronomers 33 equinox 33 orbiting 33 Regulus 33 galactic 33 rocky planets 33 Iapetus 33 moon 33 corona 33 comets 32 infrared wavelengths 32 supernovas 32 Spitzer Space Telescope 32 quasars 32 solstice 32 fainter 32 supernovae 32 exoplanet 32 Aurora Borealis 32 Constellations 32 cosmic microwave background 32 stargazers 32 triangle shaped 32 asteroid belt 32 elliptical orbit 31 distant galaxies 31 numerals 31 Galactic 31 starburst 31 asteroids 31 Nebula 31 supermassive black hole 31 amateur astronomers 31 meteor showers 31 observatory 31 brown dwarfs 31 meteors