Related by context. Frequent words. (Click for all words.) 51 Mauna Kea 49 astronomical observatory 48 extinct volcano 46 lava tubes 46 Lick Observatory 45 Kitt Peak 45 WM Keck Observatory 45 observatory 44 Palomar Observatory 43 Pan STARRS 43 optical telescope 42 lava tube 42 Kilauea volcano 41 Thirty Meter Telescope 41 Keck Observatory 41 Cancri 41 telescope 40 volcanically active 40 seamount 39 innermost planet 39 observatories 39 ecliptic 39 constellation Perseus 39 Andromeda galaxy 39 telescopes 38 orbiting telescope 38 Sedna 38 Southern Hemisphere 38 Kitt Peak National 38 whale skeleton 37 Comet McNaught 37 Observatories 37 infrared telescope 37 microlensing 37 orbiting Saturn 37 Lowell Observatory 37 hill overlooking 36 National Optical Astronomy 36 Perseid meteor shower 36 IceCube 36 Observatory 36 icecap 36 constellation Leo 36 Milky Way Galaxy 36 Arecibo Observatory 36 Galápagos 36 southern hemisphere 36 distant galaxy 36 Galaxy Evolution 35 Leonid meteor shower 35 Punta Arenas Chile 35 Chile Atacama Desert 35 optical telescopes 35 located 35 ESO Very Large Telescope 35 southernmost 35 Iguazu Falls 35 Allen Telescope Array 35 western hemisphere 34 particle detector 34 Hawaiian Volcano Observatory 34 Hubble Telescope 34 Orion Nebula 34 Antartica 34 Very Large Array 34 where 34 SELENE 33 Forks Wash. 33 meteor shower 33 lighthouse 33 astronomers 33 COROT 33 interplanetary spacecraft 33 Bariloche 33 southernmost tip 33 Griffith Observatory 33 Astronomy 33 Canary Islands 33 continent 33 THEMIS 32 celestial object 32 Antarctica 32 moon Charon 32 Gravity Probe B 32 northernmost 32 orbiting observatory 32 Geminids 32 Gemini Observatory 32 extrasolar planet 32 Chile 32 extrasolar planets 32 NanoSail D 32 Telescope 32 locale 32 astronomical observations 31 circumpolar 31 Andes Mountains 31 HiRISE 31 Kepler telescope 31 Eta Carinae 31 west longitude