Related by context. Frequent words. (Click for all words.) 60 Spectrometer 60 spectroscopic 57 spectroscopy 57 spectrometry 56 spectrometer 56 radiometer 56 solar corona 55 magnetosphere 55 shorter wavelengths 55 infrared radiation 55 infrared wavelengths 54 infrared spectrometer 54 alpha particles 54 Hubble observations 54 Galaxy Evolution 54 HD #b [002] 54 planetary scientist 54 gamma rays 54 infrared spectroscopy 54 ejecta 54 ionized gas 54 X ray emission 54 aerosol particles 54 NASA Goddard 54 GeV 53 muon 53 antiprotons 53 Raman spectroscopy 53 interstellar medium 53 interferometer 53 extrasolar planet 53 ionosphere 53 cosmic ray 53 redshift 53 comet dust 52 cosmic microwave background 52 Enceladus 52 planet orbiting 52 spectra 52 astrophysical 52 comet nucleus 52 visible wavelengths 52 GRBs 52 mass spectroscopy 52 CALIPSO 52 interferometry 51 Spectroscopy 51 cosmic rays 51 MESSENGER 51 Cassini imaging 51 mass spectrometer 51 muons 51 Saturn moon Enceladus 51 ionization 51 ionized 51 Cassini 51 XMM Newton 51 X ray telescope 51 spectrometers 51 Saturn rings 51 magnetic fields 51 positron 51 Astrophysical Journal 50 Eta Carinae 50 ionospheric 50 FRET 50 silicates 50 OSIRIS 50 electron beams 50 WM Keck Observatory 50 gravitational lensing 50 rocky planets 50 particle beam 50 diffractive 50 Fluorescence 50 neutrino 50 MARSIS 50 high temperature superconductivity 50 extrasolar planets 50 distant galaxies 50 gamma ray burst 50 terrestrial planets 50 NICMOS 50 Earth magnetosphere 50 Astrophysicist 50 transmission electron microscope 50 exoplanet 50 particles 50 laser ablation 50 interstellar dust 50 planets orbiting 50 galaxy formation 50 optical microscopy 50 hydrogen ions 49 solar nebula 49 NASA Cassini spacecraft 49 Astrophysical Journal Letters 49 radiative 49 gravitational waves 49 THEMIS 49 hydroxyl