Related by context. Frequent words. (Click for all words.) 60 WM Keck Observatory 58 Keck Observatory 57 XMM Newton 56 active galactic nuclei 56 Mauna Kea Hawaii 56 redshifts 56 Gemini Observatory 55 spectroscopic 54 Galaxy Evolution 54 Hubble observations 54 Astrophys 53 Astrophysicist 53 galaxy clusters 53 redshift 52 interferometry 52 SDSS 52 microlensing 52 optical telescopes 52 Credit NASA JPL 52 Lick Observatory 51 quasars 51 CRISM 51 OGLE 51 CfA 51 elliptical galaxies 51 WMAP 51 infrared mapping spectrometer 51 Astrophysical Journal 51 ESO Very Large Telescope 51 X ray Observatory 50 NASA Chandra 50 bathymetry 50 hyperspectral 50 Astrophysical Journal Letters 50 Astrophysicists 50 Suzaku 50 Monthly Notices 50 planetary nebulae 50 Cancri 50 astronomers 50 X ray emission 49 globular clusters 49 supernova remnants 49 radial velocity 49 distant galaxies 49 Pan STARRS 49 Observatories 49 Type Ia supernovae 49 astrophysicists 49 infrared wavelengths 49 COBE 49 galaxy cluster 49 numerical simulations 49 galaxies 49 Mini SAR 48 JPL manages 48 WFC3 48 spectra 48 astronomical objects 48 GRBs 48 star Gliese 48 Geochemistry 48 IODP 48 THEMIS 47 SPIRE 47 galaxy formation 47 astronomical observations 47 multispectral 47 GRB # 47 extrasolar planets 47 Quantec 47 astrophysical 47 NICMOS 47 Palomar Observatory 47 EPOXI 47 spectroscopy 47 NASA ESA Hubble 47 dwarf galaxy 47 NASA Mars Odyssey 47 NASA Cassini 47 Astrophysics 47 gravitational lensing 47 Spectroscopy 47 planetary scientist 47 NASA Cassini spacecraft 46 spacecraft orbiting 46 globular cluster 46 CIRS 46 comet nucleus 46 WM Keck 46 NASA JPL Caltech 46 ASTER 46 IP geophysical 46 Arecibo Observatory 46 NASA Kepler 46 quasar 46 radiometer 46 Very Large Telescope 46 Garching Germany 46 COROT 46 supernovae