Related by context. Frequent words. (Click for all words.) 60 Fomalhaut 57 galaxy NGC 57 constellation Leo 56 infrared wavelength 55 planetary nebulae 55 solar corona 55 photosphere 55 constellation Orion 55 planetary nebula 54 galaxy cluster 54 Kuiper belt 54 stellar nurseries 53 HD #b [002] 53 Earthlike 53 noctilucent clouds 53 icy moons 53 Cancri 53 planet Uranus 53 aurorae 53 Eagle Nebula 53 Crab Nebula 53 Betelgeuse 53 Oort Cloud 52 planet orbits 52 undersea volcanoes 52 Andromeda galaxy 52 celestial object 52 Andromeda Galaxy 52 hydrothermal vent 52 Carina Nebula 52 WASP #b 52 ultraviolet wavelengths 51 visible wavelengths 51 Orion Nebula 51 active galactic nuclei 51 constellation Gemini 51 Olympus Mons 51 X ray emission 51 nebula 51 Cepheids 51 constellation 51 nebulas 50 thermocline 50 intertidal zone 50 exosphere 50 amphipods 50 Mimas 50 supernova remnant 50 distant galaxy 50 VIRTIS 50 polar vortex 50 Keck telescope 50 constellation Perseus 49 auroral 49 Jupiter Saturn 49 ecliptic 49 Milky Way Galaxy 49 metallicity 49 La Silla Chile 49 spiral galaxies 49 optical wavelengths 49 gravitational lens 49 protoplanetary disk 49 Large Magellanic Cloud 49 planktonic 49 Sunspots 48 reddish hue 48 volcanically active 48 Keck Observatory 48 torus 48 photometer 48 astronomical objects 48 Uranus 48 mesosphere 48 underwater volcanoes 48 polar caps 48 lava tubes 48 Deneb 48 distant galaxies 48 Arcturus 48 Lulin 48 heliosheath 48 Pisces 48 Cassiopeia 48 WM Keck Observatory 48 star Gliese 48 Galaxy Evolution 48 Sedna 48 galaxy clusters 48 accretion disk 48 dwarf galaxy 47 unaided eye 47 phosphorescence 47 Valles Marineris 47 moonlets 47 quasar 47 nebulae 47 Equatorial Pacific 47 redshift 47 Phaethon 47 interferometric