Related by context. Frequent words. (Click for all words.) 59 optical telescopes 57 telescopes 55 interferometry 54 astronomical observations 54 astronomers 54 XMM Newton 54 interferometer 53 observatories 53 distant galaxies 53 gravitational wave 53 redshift 53 Spitzer Space Telescope 53 gravitational lensing 52 infrared wavelengths 52 spectroscopic 52 wavelengths 52 Very Large Telescope 52 gamma ray bursts 51 adaptive optics 51 X ray emission 51 spectrometers 51 distant galaxy 51 pulsars 51 galaxy clusters 51 globular clusters 51 extrasolar planets 50 X ray Observatory 50 COROT 50 JWST 50 astrophysicists 50 Andromeda Galaxy 50 spectroscopy 50 GRBs 50 galaxies 50 supernova remnant 50 IceCube 50 galaxy cluster 50 optical telescope 50 Terahertz 49 Spectrometer 49 CCDs 49 supernovae 49 cosmologists 49 astrophysical 49 spiral galaxies 49 multispectral 49 rocky planets 49 NASA Chandra 49 neutrino 49 magnetar 49 neutrinos 49 infrared detectors 49 brown dwarfs 49 gravitational waves 48 exoplanets 48 celestial objects 48 gamma rays 48 muons 48 Milky Way Galaxy 48 Orion Nebula 48 telescope 48 general relativity 48 dwarf galaxy 48 quasars 48 planets orbiting 48 gamma ray burst 47 dwarf galaxies 47 optical microscope 47 beamline 47 infrared 47 Milky Way galaxy 47 interstellar dust 47 LIGO 47 elliptical galaxies 47 WMAP 47 Cassini Huygens 47 WM Keck Observatory 47 spectrograph 47 laser pulses 47 gamma ray 47 THEMIS 47 Solar System 47 cosmic microwave background 47 GLAST 47 spacetime 47 positrons 47 atomic nuclei 47 Space Telescope 47 photons 46 Raman spectroscopy 46 terrestrial planets 46 x ray imaging 46 ESO Very Large Telescope 46 spectrometer 46 CMEs 46 scanning electron microscope 46 quasar 46 extrasolar planet 46 photonic crystals 46 gravitationally 46 metamaterials