Related by context. Frequent words. (Click for all words.) 59 X ray emission 58 auroral 57 pulsars 57 GRBs 56 Gamma ray bursts 56 auroras 56 astronomical observations 55 supernovas 55 Computer simulations 54 aerosol particles 54 astronomers 54 quasars 54 gravitational wave 54 magnetar 53 ionospheric 53 gamma ray burst 53 astronomical objects 53 cosmic ray 53 aurora 53 dwarf galaxies 53 gravitational waves 53 XMM Newton 53 galaxies 52 HD #b [002] 52 celestial objects 52 substorms 52 quasar 52 subatomic particle 52 distant galaxy 52 excitons 52 interstellar dust 52 Very Large Array 52 distant galaxies 52 comet nucleus 52 supernovae 52 optical telescopes 51 supernova explosions 51 infrared wavelengths 51 dwarf galaxy 51 quark gluon plasma 51 galaxy formation 51 WIMPs 51 magnetic fields 51 Orion Nebula 51 extrasolar planet 51 gamma ray bursts 51 astrophysical 51 extrasolar planets 51 supernova remnant 51 supernova 50 habitable planets 50 Earth magnetosphere 50 neutron stars 50 comet 50 Andromeda galaxy 50 Martian surface 50 rocky planets 50 pulsations 50 neutrino 50 super Earths 50 orbiting spacecraft 50 celestial object 49 galaxy clusters 49 ionosphere 49 planets orbiting 49 terrestrial planets 49 cosmologists 49 Saturn rings 49 wavelengths 49 galaxy cluster 49 astrophysicists 49 NASA Cassini spacecraft 49 atomic particles 49 planets 49 geomagnetic storms 49 atmospheric 49 Saturn moons 49 WMAP 48 coronal mass ejections 48 gamma rays 48 celestial bodies 48 photonic crystal 48 amplitudes 48 microlensing 48 globular clusters 48 dust devils 48 supernova explosion 48 cosmic rays 48 organic molecules 48 supermassive black hole 48 plasmons 48 interferometry 48 accretion disk 48 Kuiper belt 48 elliptical galaxies 48 telescopes 48 Jupiter moons 48 meteoroids 48 oxygen isotopes 48 meteoroid 48 brown dwarfs