Related by context. Frequent words. (Click for all words.) 65 solar corona 63 aurorae 61 substorm 60 interplanetary spacecraft 60 auroral 60 polar vortex 59 WASP #b 59 Earth magnetosphere 59 planet Uranus 59 X ray emission 59 coronal mass ejections 59 ultraviolet wavelengths 59 Cosmic rays 58 planetary nebulae 58 ionospheric 58 noctilucent clouds 58 innermost planet 58 active galactic nuclei 57 meteoroids 57 Jupiter Saturn 57 Solar flares 57 Saturn rings 57 Earthlike 57 Venusian 57 planetesimals 57 solar flares 57 magnetic reconnection 57 gravitational lensing 57 planetary nebula 57 comet 57 supernova explosion 57 outer planets 56 mesosphere 56 planets 56 novae 56 comets 56 Gamma rays 56 shorter wavelengths 56 HD #b [002] 56 Cepheids 56 magnetic fields 56 Galileo spacecraft 56 magnetars 56 moonlets 55 solar nebula 55 meteoroid 55 dust devils 55 protoplanetary disk 55 ionosphere 55 Sunspots 55 hot Jupiters 55 convective 55 ultra violet radiation 55 comet tail 55 substorms 55 starbursts 55 cosmic rays 55 geomagnetic storms 55 Keck telescope 55 polar caps 55 magnetosphere 55 supernova explosions 55 ionised 55 interstellar medium 54 nebulas 54 ringed planet 54 SIRTF 54 ionized gas 54 astronomers 54 CMEs 54 interferometry 54 spacetime 54 Iapetus 54 accretion disk 54 Cabeus crater 54 Kuiper belt 54 XMM Newton 54 Halley comet 54 auroras 54 Oort Cloud 54 Orion Nebula 54 terrestrial planets 54 numerical simulations 54 celestial bodies 54 nebulae 54 VIRTIS 54 cosmic ray 53 visible wavelengths 53 Voyager spacecraft 53 Gamma ray bursts 53 supernova remnants 53 Olympus Mons 53 Haumea 53 interferometric 53 COROT 53 gamma rays 53 Type Ia supernovae 53 morphologies 53 tropospheric 53 astrophysical 53 moon Charon