Related by context. Frequent words. (Click for all words.) 69 troposphere 63 ionosphere 63 magnetosphere 61 aerosol particles 60 Earth magnetosphere 59 equatorial regions 59 mid latitudes 58 heliosphere 58 Enceladus 57 perigee 57 Saturn rings 57 X ray emission 57 substorms 57 water vapor 57 sunspot activity 56 Martian atmosphere 56 interstellar medium 56 polar regions 56 convective 56 HD #b [002] 56 cosmic rays 55 comet nucleus 55 stratospheric ozone 55 moon Titan 55 ejecta 55 Iapetus 55 Eta Carinae 55 latitudes 55 COROT 55 albedo 54 icecap 54 infrared radiation 54 coronal mass ejections 54 Tibetan Plateau 54 infrared wavelengths 54 polar caps 53 terrestrial planets 53 ringed planet 53 atmospheric circulation 53 cosmic ray 53 equator 53 cosmic microwave background 53 gamma ray burst 53 galaxy cluster 53 vertical wind shear 53 Milky Way Galaxy 53 vortices 53 quark gluon plasma 53 geomagnetic field 53 rocky planets 53 Itokawa 53 atmospheric 53 Saturn moon 52 geosynchronous orbit 52 astrophysical 52 superfluid 52 NASA Aqua 52 supernova explosions 52 atmospheric chemistry 52 magnetic fields 52 circular orbit 52 infrared spectrometer 52 GRBs 52 Andromeda Galaxy 52 aerosols 52 Cassini Huygens 52 ecliptic 52 altitudes 51 temperature gradient 51 coronal mass ejection 51 super Earths 51 brown dwarfs 51 supernova remnant 51 planet orbiting 51 Saturn moons 51 geomagnetic 51 cosmic radiation 51 THEMIS 51 gravitational waves 51 Milky Way 51 Earth orbit 51 cometary 51 equatorial 51 Cassini 51 radiative 51 cumulus clouds 51 Sunspots 51 Martian surface 51 orbits 51 neutron star 51 volcanic gases 51 silicates 50 distant galaxies 50 galaxy clusters 50 redshift 50 polar orbit 50 comets 50 geomagnetic storms 50 comet 50 supermassive black hole 50 exoplanets