Related by context. Frequent words. (Click for all words.) 57 X ray emission 56 collimated 56 galaxy NGC 55 supernova remnant 55 gamma ray 54 Gamma ray bursts 54 magnetar 53 Solar flares 53 particles emitted 53 X ray fluorescence 53 active galactic nuclei 53 supernova explosion 53 keV 53 Hawking radiation 52 magnetars 52 plasmon 52 ionised 52 Eta Carinae 52 ionized gas 52 interferometric 52 accretion disk 51 GRB # 51 quasar 51 infrared wavelength 51 photometer 51 impactors 51 ionisation 51 Gamma rays 51 moon Enceladus 51 dwarf galaxy 51 microwave radiation 51 supernova explosions 50 red supergiant 50 ultraviolet wavelengths 50 Type Ia supernovae 50 electromagnetic EM 50 ionize 50 gamma ray burst 50 ionizing 49 pulsed laser 49 photoluminescence 49 galaxy cluster 49 colliding galaxies 49 X ray Observatory 49 near infrared NIR 49 redshifts 49 MeV 49 positron 49 gravitational lens 49 quasars 49 spectrographs 49 distant galaxy 49 spiral galaxies 49 beam splitter 49 detector 48 emitted 48 constellation Sagittarius 48 Crab Nebula 48 HiRISE camera 48 supernova remnants 48 meteoroid 48 planetary nebula 48 Earthlike 48 magnetron 48 novae 48 solar corona 48 substorm 48 shorter wavelengths 48 supernovas 48 interferometers 48 X ray beam 48 distant galaxies 48 Ultraviolet radiation 48 globular cluster 48 interferometry 48 helium atoms 48 photometry 48 Ultraviolet light 48 magnetic fields 48 supernovae 48 infrared lasers 48 subcritical 47 protostars 47 panchromatic 47 astrophysical 47 neutron star 47 Emitting 47 visible wavelengths 47 Carina Nebula 47 PET positron emission tomography 47 torus 47 spectrometry 47 gamma rays 47 auroral 47 metallicity 47 fluorophores 47 Andromeda galaxy 47 Earth magnetosphere 47 alpha particle 47 galaxy formation 47 protostar