Related by context. Frequent words. (Click for all words.) 76 WM Keck Observatory 66 Gemini Observatory 62 Lick Observatory 61 infrared telescope 61 Very Large Telescope 61 optical telescopes 61 spectroscopic 60 Pan STARRS 60 interferometry 60 optical telescope 60 ESO Very Large Telescope 60 NASA Chandra 59 Very Large Array 59 interferometer 59 telescope 59 telescopes 58 Arecibo Observatory 58 microlensing 58 Palomar Observatory 57 XMM Newton 57 supernova remnant 57 optical microscopy 57 Spitzer Space Telescope 56 radiometer 56 Telescope 56 transmission electron microscope 56 NASA Cassini spacecraft 56 MODIS 56 VLBA 55 scanning electron microscope 55 astronomers 55 laser pulses 54 Galaxy Evolution 54 NASA ESA Hubble 54 Credit NASA JPL 54 observatories 54 Kitt Peak 54 Hinode 54 hyperspectral 54 gravitational wave 54 seismometers 54 distant galaxies 54 Voyager spacecraft 54 infrared wavelengths 53 X ray emission 53 distant galaxy 53 optical microscope 53 auroral 53 adaptive optics 53 NASA JPL Caltech 53 gravitational lensing 53 X ray Observatory 53 Observatories 53 Space Telescope 53 infrared spectrometer 53 infrared 52 spectrometer 52 seismometer 52 confocal microscopy 52 X ray telescope 52 gamma ray 52 Planetary Laboratory 52 numerical simulations 52 InGaAs 52 Raman spectroscopy 52 Thirty Meter Telescope 52 redshift 52 orbiting Saturn 52 IceCube 52 Type Ia supernovae 52 X ray diffraction 52 GRB # 51 Astronomers 51 seismographs 51 galaxy cluster 51 transmission electron microscopy 51 ionospheric 51 CALIPSO 51 SQUID 51 astronomical objects 51 astronomical observations 51 Crab Nebula 51 spectroscopy 51 THEMIS 51 cosmic microwave background 51 scanning tunneling microscope 51 spectrograph 51 Advanced Photon Source 51 infrared spectroscopy 51 LIGO 51 Orion Nebula 51 NRAO 50 HD #b [002] 50 Spectrometer 50 extrasolar planets 50 photodetector 50 Cassini imaging 50 NASA Aqua 50 observatory 50 laser pulse 50 gravitational waves