Related by context. Frequent words. (Click for all words.) 64 XMM Newton 63 photometer 61 Spectrometer 60 spectrographs 59 gravitational wave 59 X ray telescope 59 Galaxy Evolution 59 spectroscopic 59 gamma ray 59 radial velocity 59 interferometer 59 CfA 59 interferometry 58 radiometer 58 National Astronomical Observatory 58 X ray emission 57 Hubble observations 57 attosecond 57 microlensing 57 Spectroscopy 57 STScI 56 neutron scattering 56 Southern Observatory ESO 56 Cassini radar 56 magnetar 56 NASA Chandra 56 photometry 56 muon 56 ionospheric 56 X ray Observatory 56 Mini SAR 56 ESO Very Large Telescope 56 spectroscopy 56 NICMOS 55 FRET 55 Garching Germany 55 LLNL 55 ionisation 55 photometric 55 OSIRIS 55 cosmic ray 55 gravitational waves 55 positron 55 gravitational lensing 55 COROT 55 infrared mapping spectrometer 55 gamma rays 55 numerical simulations 55 solar corona 55 European Synchrotron Radiation 55 COBE 55 particle detector 54 Keck Observatory 54 magnetic reconnection 54 Mauna Kea Hawaii 54 Raman spectroscopy 54 infrared spectroscopy 54 GRB # 54 VLBI 54 gamma ray burst 54 CIRS 54 WMAP 54 particle detectors 54 infrared telescope 54 multispectral 53 cosmic rays 53 NASA ESA Hubble 53 Lunar Prospector 53 muons 53 ionised 53 CRISM 53 X ray diffraction 53 Fluorescence 53 mass spectroscopy 53 Gemini Observatory 53 spectrometer 53 WFC3 53 extrasolar planet 53 NASA Goddard 53 quasar 53 Type Ia supernovae 53 supernova remnant 53 NASA Cassini 53 Very Large Telescope 53 VLBA 53 interplanetary spacecraft 52 spectrometry 52 WM Keck Observatory 52 transmission electron microscope 52 synchrotron radiation 52 active galactic nuclei 52 antiprotons 52 keV 52 infrared radiation 52 JILA 52 redshifts 52 NASA Cassini spacecraft 52 dispersive 52 Very Large Array 52 infrared 52 CALIPSO