Related by context. Frequent words. (Click for all words.) 64 X ray emission 61 Gamma ray bursts 61 ultraviolet wavelengths 61 solar corona 60 active galactic nuclei 60 aurorae 59 icy moons 59 shorter wavelengths 59 optical wavelengths 59 gravitational lens 58 auroral 58 GRBs 58 substorm 58 radial velocity 57 photosphere 57 moon Enceladus 57 astronomical objects 57 Cepheids 57 gaseous planets 57 stellar nurseries 57 exosphere 56 terahertz radiation 56 Cosmic rays 56 supernova remnants 56 supernova remnant 56 planetary nebulae 56 protostars 56 moonlets 56 visible wavelengths 56 Ultraviolet light 56 HD #b [002] 56 XMM Newton 56 magnetars 56 tropospheric 56 Galaxy Evolution 56 diffraction pattern 56 infrared wavelength 55 microlensing 55 infrared wavelengths 55 gravitational wave 55 galaxy NGC 55 photometry 55 Type Ia supernovae 55 polar vortex 55 redshifts 55 Gamma rays 55 nebulae 54 WIMPs 54 novae 54 dwarf galaxy 54 infrared radiation 54 nebulas 54 terrestrial planets 54 WASP #b 54 fainter 54 near infrared NIR 54 Saturn moon Enceladus 54 galaxy formation 54 spectroscopic 54 hydrothermal activity 54 Ultraviolet radiation 54 interstellar dust 54 habitable zones 54 Earth magnetosphere 53 interferometric 53 unaided eye 53 protoplanetary disk 53 surface plasmons 53 metallicity 53 gravitational waves 53 gravitational lensing 53 microwave radiation 53 Earthlike 53 Solar flares 53 Carina Nebula 53 orbiting planets 53 gamma ray burst 53 electromagnetic EM 53 substorms 53 distant galaxies 53 infrared spectroscopy 53 anisotropy 53 Higgs particle 53 gamma ray bursts 53 heavily cratered 53 interferometry 53 geomagnetic field 53 plasmon 53 noble gases 53 particle detectors 52 magnetar 52 photoluminescence 52 cosmic rays 52 Enceladus 52 interplanetary spacecraft 52 fluorophores 52 VIRTIS 52 noctilucent clouds 52 Crab Nebula 52 planet orbiting 52 aurora