Related by context. Frequent words. (Click for all words.) 57 telescope 54 telescopes 50 Celestron 48 optical telescope 48 stargazer 47 Crab Nebula 47 adaptive optics 47 interplanetary spacecraft 47 Space Telescope 47 astronomy 47 optics 47 Webb Telescope 46 observatory 46 Palomar Observatory 46 infrared telescope 46 eyepieces 45 Lick Observatory 45 Lowell Observatory 44 NanoSail D 44 Saturn rings 44 spectrometers 44 amateur astronomers 44 optical telescopes 44 X ray telescope 44 Telescope 44 Orion Nebula 44 eyepiece 43 astronomer 43 Telescopes 43 astronomical observatory 43 Hubble telescope 43 Voyager spacecraft 43 CubeSat 43 supernova remnant 43 CCD camera 43 interferometer 42 geodesic dome 42 astronomers 42 distant galaxies 42 Hubble Telescope 42 amateur astronomer 42 SkyScout 42 Hubble 42 holography 42 Andromeda galaxy 42 astronomical objects 42 star gazers 42 extrasolar planet 42 nebulae 42 Milky Way Galaxy 42 cosmic ray 41 Arecibo Observatory 41 infrared 41 Andromeda Galaxy 41 VLBA 41 astrophysicist 41 sundial 41 telescopic 41 Jodrell Bank 41 Astronomy 41 ESO Very Large Telescope 41 pinhole camera 41 lenses 41 Keck Observatory 41 infrared detectors 41 Mars Pathfinder 41 photonic crystals 41 Astrophysicist 41 sailplane 41 Astronomer 41 Astrophysicists 41 interferometry 41 cosmologists 41 astronomical observations 41 THEMIS 41 imager 41 constellation Orion 40 orbiting telescope 40 Kitt Peak 40 starbursts 40 celestial object 40 Very Large Array 40 camera obscura 40 planetarium 40 JWST 40 quasars 40 seismometer 40 Eta Carinae 40 magnifying lens 40 constellation 40 reflector 40 physicist 40 orbiting spacecraft 40 orb 40 Solar Dynamics 40 Galaxy Evolution 40 optical microscope 40 spectrometer 40 orbiting observatory 40 satellites 40 gravitational lensing