Related by context. Frequent words. (Click for all words.) 55 XMM Newton 49 spectra 47 spectroscopic 46 redshift 45 astronomers 44 infrared wavelengths 43 extrasolar planets 43 Very Large Telescope 43 assessees 42 interferometer 42 galaxy cluster 42 globular clusters 42 Spectrometer 41 cosmic microwave background 41 gamma ray burst 41 SDSS 41 WMAP 41 spectrograph 41 extrasolar planet 41 Telescope 41 JWST 41 elliptical galaxies 41 ESO 41 planet orbiting 40 LRO 40 quasar 40 exoplanet 40 Inland Revenue 40 nebula 40 NSDL 40 Envisat 40 IRD 40 CBEC 40 adaptive optics 40 Cassiopeia 40 quasars 39 infrared radiation 39 MR 39 HiRISE 39 CBDT 39 astrophysicists 39 GRS 39 HD #b [002] 39 planets orbiting 39 PAYE 39 galaxy clusters 39 exoplanets 38 Spitzer Space Telescope 38 HMRC 38 spectral 38 supernovae 38 NASA Cassini spacecraft 38 distant galaxies 38 spectroscopy 38 Space Telescope 38 NASA Chandra 38 Fluorescence 38 pulsar 38 aurora 38 Sedna 37 STEREO 37 IRS 37 FGS 37 MPF 37 brown dwarf 37 Astrophysics 37 ERS 37 celestial objects 37 NASA Goddard 37 ATO 37 dynamical 37 amplitudes 37 telescope 37 gamma ray bursts 37 isotopic 37 CCD camera 37 diffraction 37 spatial resolution 37 brown dwarfs 37 taxman 37 galaxies 36 Spectroscopy 36 fainter 36 WISE 36 neutron star 36 laser pulses 36 distant galaxy 36 GIT 36 MESSENGER 36 dwarf galaxies 36 decadal 36 astronomer 36 interstellar medium 36 Mars Reconnaissance Orbiter 36 GRB 36 Raman spectroscopy 36 NGC 35 THEMIS 35 FSS 35 Betelgeuse 35 supernova