Related by context. Frequent words. (Click for all words.) 74 X ray emission 67 GRBs 66 gamma rays 65 cosmic rays 65 gamma ray burst 64 supernovae 64 supernova explosion 64 cosmic ray 63 Eta Carinae 63 supernova remnant 63 quasar 62 supernova explosions 62 gamma ray bursts 62 supernova 62 redshift 62 gamma ray 61 quasars 61 ejecta 60 neutrinos 60 elliptical galaxies 60 CMEs 60 distant galaxy 59 supermassive black hole 59 interstellar medium 59 neutron star 59 laser pulse 59 magnetic fields 59 GRB 58 distant galaxies 58 galaxy cluster 58 XMM Newton 58 spiral galaxies 58 spectra 58 neutrino 58 supernovas 57 photons 57 astrophysical 57 laser pulses 57 galaxy clusters 57 pulsations 57 wavelengths 57 oscillations 57 HD #b [002] 57 positrons 57 quark gluon plasma 57 pulsars 56 gravitational waves 56 radiative 56 coronal mass ejections 56 neutron stars 56 gravitational lensing 56 solar flares 56 anisotropy 56 dwarf galaxy 56 amplitudes 56 interferometry 56 cosmic microwave background 56 brown dwarfs 56 coronal mass ejection 56 pulsar 56 galaxies 55 supermassive black holes 55 infrared wavelengths 55 vortices 55 radioactive decay 55 planet orbiting 55 interstellar dust 55 Milky Way Galaxy 55 spacetime 55 velocities 55 excitation 55 nebulae 55 spectroscopic 55 nuclei 55 spiral galaxy 55 corona 54 nebula 54 aurora 54 photon 54 cosmologists 54 coronal 54 atomic nuclei 54 dwarf galaxies 54 occultation 54 sunspot 54 globular clusters 54 luminosity 54 ecliptic 53 electron volts 53 comet nucleus 53 ionization 53 Milky Way galaxy 53 astronomers 53 orbits 53 Saturn rings 53 auroras 53 planets orbiting 53 WMAP 53 astrophysicists 53 ionizing 53 brown dwarf