Related by context. Frequent words. (Click for all words.) 59 infrared telescope 58 X ray telescope 58 XMM Newton 57 Spectrometer 56 Astrophysicists 56 optical telescopes 56 particle detectors 56 interplanetary spacecraft 55 Galaxy Evolution 55 photometer 54 particle detector 53 optical telescope 53 Cassini Huygens 53 GLAST 52 spectroscopic 52 observatories 52 NASAs 52 interferometry 52 Resolution Imaging 52 active galactic nuclei 52 X ray Observatory 52 interferometer 51 planetary nebulae 51 telescopes 51 astrophysicists 51 hyperspectral 51 astrophysical 51 COROT 51 Cosmic rays 50 transmission electron microscope 50 spectrograph 50 Pan STARRS 50 spacecraft 50 Observatories 50 NASA ESA Hubble 50 CubeSats 50 WFC3 50 Space Telescope 50 solar corona 50 OSIRIS 50 telescope 50 astronomers 50 Southern Observatory ESO 50 synchrotron radiation 50 NASA Cassini 50 spacecraft orbiting 50 Keck Observatory 50 gravitational wave 49 Astrophysicist 49 distant galaxies 49 radiometer 49 Very Large Array 49 particle beam 49 Voyager spacecraft 49 cosmic ray 49 gamma rays 49 Stardust spacecraft 49 ESO Very Large Telescope 49 Palomar Observatory 49 WM Keck Observatory 49 STScI 49 Gemini Observatory 49 Kitt Peak 49 spectrometer 49 Hubble observations 48 Mauna Kea Hawaii 48 gamma ray bursts 48 LIGO 48 spacecrafts 48 SPIRE 48 numerical simulations 48 ion propulsion 48 Spitzer Space Telescope 48 extrasolar planet 48 CubeSat 48 beamline 48 National Astronomical Observatory 48 CloudSat 48 gamma ray burst 48 particle accelerators 48 NASA Cassini spacecraft 48 quasars 48 robotic spacecraft 48 NASA Kepler 48 Remote sensing 48 polar orbiting 48 Observatory 48 Ultrafast 48 STIS 47 CALIPSO 47 Gamma ray bursts 47 Advanced Photon Source 47 CRISM 47 GRB # 47 magnetars 47 Suzaku 47 Cassini spacecraft 47 optical microscopy 47 Synchrotron 47 THEMIS 47 JWST