Related by context. Frequent words. (Click for all words.) 69 magnetosphere 67 Earth magnetosphere 65 heliosphere 60 X ray emission 60 ionosphere 60 orbits 59 interstellar medium 59 spacetime 59 vortices 59 ejecta 58 interstellar dust 58 comet nucleus 58 superfluid 58 Saturn rings 57 magnetization 57 infrared wavelengths 57 galaxy cluster 57 cosmic rays 57 comet 57 Iapetus 56 polar caps 56 Milky Way Galaxy 56 ecliptic 56 anisotropy 55 troposphere 55 XMM Newton 55 gravitationally 55 HD #b [002] 55 circular orbit 55 corona 55 interstellar space 55 occultation 55 elliptical orbit 54 convective 54 ringed planet 54 outer planets 54 distant galaxy 54 oscillations 54 neutron star 54 quasar 54 substorms 54 umbra 54 nebula 54 polar regions 54 Saturn moons 54 Itokawa 53 conductance 53 Enceladus 53 astronomical objects 53 torus 53 spiral galaxy 53 NASA Cassini spacecraft 53 gravitational waves 53 Martian surface 53 distant galaxies 53 supernova remnant 53 equator 53 geomagnetic field 53 geosynchronous orbit 53 Jupiter moons 53 terrestrial planets 53 cosmic ray 53 interferometer 53 crustal 52 Solar System 52 cometary 52 galaxy clusters 52 sunspot 52 phonons 52 galaxy 52 ellipse 52 magnetar 52 Orion Nebula 52 supermassive black hole 52 Martian atmosphere 52 infrared radiation 52 COROT 52 dynamical 52 GRBs 52 Cassini Huygens 52 Jupiter Saturn Uranus 52 extrasolar planet 52 waveguides 52 coronal mass ejection 52 gamma rays 52 perigee 52 magnetic fields 52 amplitudes 51 photons 51 geomagnetic 51 Cassini 51 spectra 51 Cassini spacecraft 51 laser pulse 51 planets 51 temperature gradient 51 filaments 51 spectroscopic 51 gravitational wave 51 coronal mass ejections 51 Uranus