Related by context. Frequent words. (Click for all words.) 68 X ray emission 65 interstellar medium 65 magnetosphere 64 corona 64 HD #b [002] 64 ejecta 63 Earth magnetosphere 63 magnetar 62 heliosphere 61 interstellar dust 61 supernova remnant 60 nebula 60 nebulae 60 infrared wavelengths 60 ionosphere 60 ecliptic 59 magnetic fields 59 superfluid 59 Saturn rings 59 sunspots 59 Milky Way Galaxy 59 Eta Carinae 59 planet orbiting 59 GRBs 59 Enceladus 58 Orion Nebula 58 supernova explosion 58 supernova explosions 58 troposphere 58 silicates 58 Iapetus 58 terrestrial planets 58 galaxy cluster 57 supermassive black hole 57 high temperature superconductivity 57 gravitational lensing 57 rocky planets 57 neutron star 57 coronal mass ejections 57 ringed planet 57 sunspot 56 Kuiper Belt 56 coronal mass ejection 56 quasars 56 comet nucleus 56 gamma rays 56 brown dwarf 56 convective 56 substorms 56 planets 56 spacetime 56 quasar 56 gravitationally 56 supernova 56 polar caps 56 distant galaxies 56 celestial bodies 55 dwarf galaxy 55 elliptical galaxies 55 Solar System 55 water vapor 55 interstellar space 55 brown dwarfs 55 cosmic rays 55 astronomical objects 55 XMM Newton 55 filaments 55 infrared radiation 55 extrasolar planet 55 radiative 55 Martian atmosphere 55 atoms 55 galaxies 55 Sunspots 55 torus 55 occultation 55 planets orbiting 55 globular clusters 55 supernovae 55 luminosity 54 auroras 54 Milky Way 54 aurora 54 anisotropy 54 muons 54 extrasolar planets 54 Andromeda Galaxy 54 quark gluon plasma 54 equatorial regions 54 solar flares 54 unaided eye 54 galaxy clusters 54 cosmic microwave background 54 orbits 54 magnetization 54 gamma ray burst 54 outer layers 54 phonons 54 galaxy 54 hot Jupiters 54 comet