Related by context. Frequent words. (Click for all words.) 51 telescope 51 CCD camera 49 photometer 48 binocular 48 Celestron 48 optical telescope 47 eyepiece 47 Palomar Observatory 46 eyepieces 46 projector 45 telescopes 45 imager 45 monocular 44 interferometric 44 observatory 44 multispectral 44 laser rangefinder 43 Keck Observatory 43 scanning electron microscope 43 #HD [002] 43 spectrographs 43 infrared 42 topographical map 42 magnifying lens 42 HiRISE camera 42 topographic map 42 Pan STARRS 42 Adaptive Optics 42 tripod mounted 42 reflector 42 Zeiss 42 planetarium 41 laser scanner 41 photometry 41 stereoscope 41 transmission electron microscope 41 Webb Telescope 41 doppler 41 infrared imagery 41 infrared camera 41 collimator 41 telescopic 41 Telescopes 41 Smartboard 41 radar altimeter 41 Telescope 41 Kitt Peak 40 Positioning System 40 magnification 40 microscopes 40 optical microscope 40 VLBA 40 ultrasonic sensors 40 Lick Observatory 40 SkyScout 40 camera viewfinder 40 Fresnel lens 40 infrared telescope 40 hyperspectral 40 Observatory 40 spectrometer 39 adaptive optics 39 thermal imager 39 Telescopic 39 Lidar 39 Skywatch 39 infrared beam 39 WFC3 39 rangefinder 39 STScI 39 infrared mapping spectrometer 39 geodesic 39 Mauna Kea Hawaii 39 Spectrometer 39 magnifier 39 superconducting magnet 39 seismometer 39 WFPC2 39 GigaPan 39 LINEAR 38 interferometer 38 projectors 38 astronomical objects 38 radiometer 38 pinhole camera 38 laser scanning 38 zoom lens 38 loupe 38 magnifications 38 LiDAR 38 Valles Marineris 38 ESO Very Large Telescope 38 Planetarium 38 amateur astronomer 38 LROC 38 spectrophotometer 37 interplanetary spacecraft 37 particle detector 37 lenses 37 holographic images 37 infrared detectors