Related by context. Frequent words. (Click for all words.) 65 X ray emission 63 magnetosphere 62 ionized gas 60 convective 59 ejecta 59 auroral 59 corona 59 heliosphere 59 Kuiper belt 58 Earth magnetosphere 58 lithosphere 58 interstellar medium 57 aerosol particles 57 nebulae 57 cirrus clouds 57 Saturn moon Enceladus 57 supernova explosions 57 Orion Nebula 57 radiative 57 ionosphere 57 Milky Way Galaxy 57 accretion disk 56 supernova remnant 56 lavas 56 planet orbits 56 troposphere 56 oceanic crust 56 terrestrial planets 56 mid latitudes 55 galaxy cluster 55 HD #b [002] 55 Saturn rings 55 nebula 55 rocky planets 55 infrared wavelengths 55 constellation Leo 55 thermosphere 54 supernova explosion 54 equatorial 54 vortices 54 Sunspots 54 magnetic fields 54 convection 54 anisotropy 54 magnetic flux 54 constellation Perseus 54 ecliptic 54 Enceladus 54 Eta Carinae 54 temperature gradient 54 ringed planet 54 magnetar 54 equatorial Pacific Ocean 54 meteoroids 53 water vapor 53 cosmic microwave background 53 basalts 53 olivine 53 galaxy clusters 53 nuclei 53 polar caps 53 torus 53 sunspot 53 irradiance 53 volcanically active 53 planet orbiting 52 Andromeda galaxy 52 oxygen isotopes 52 cumulus clouds 52 fluxes 52 Iapetus 52 liquid droplets 52 equatorial regions 52 planets 52 quasar 52 geologically active 52 sunspots 52 GPa 52 cosmic rays 52 quasars 52 comet nucleus 52 superfluid 52 substorms 52 distant galaxies 52 magmatic 52 globular cluster 52 unaided eye 52 globular clusters 52 Fomalhaut 52 brown dwarfs 52 moon Charon 52 dwarf galaxy 51 galaxies 51 infrared radiation 51 elliptical galaxies 51 coronal 51 super Earths 51 spiral galaxy 51 supermassive black hole 51 Milky Way galaxy 51 X ray beam