Related by context. Frequent words. (Click for all words.) 60 sunspot 57 Sunspots 52 sunspots 51 auroral 49 solar flares 49 aurora 47 supernova remnant 47 geomagnetic storm 46 X ray emission 46 sunspot activity 45 Andromeda Galaxy 45 geomagnetic 45 Eta Carinae 45 nebula 45 coronal mass ejection 44 Iapetus 44 Orion Nebula 44 Lunar Eclipse 44 constellation Perseus 44 Aurora Borealis 44 Arcturus 44 XMM Newton 43 constellation Leo 43 corona 43 gamma ray burst 43 convective 43 quasar 43 magnetar 43 Betelgeuse 43 cosmic ray 43 Milky Way 43 Gamma Ray 43 galaxy cluster 42 geomagnetic storms 42 auroras 42 volcanism 42 Hinode 42 storminess 42 supernova explosion 42 Perseids 41 Sedna 41 El Niño 41 Leonids 41 Saturn moon Enceladus 41 Cosmic 41 NASA Cassini spacecraft 41 HD #b [002] 41 Full Moon 41 gamma ray 41 Cassiopeia 41 Lo Fi 41 meteoroid 40 Mimas 40 NASA Aqua 40 Earth magnetosphere 40 supermoon 40 Large Magellanic Cloud 40 Nebula 40 dwarf galaxy 40 Perseid meteor shower 40 glaciation 40 supernova 40 Solar Dynamics 40 magnetosphere 39 volcanic activity 39 Supernova 39 nova 39 pulsar 39 geomagnetic field 39 Saturn rings 39 cosmic rays 39 Little Dipper 39 ecliptic 39 dust devils 39 Palomar Observatory 39 supernovae 39 Atmosphere 39 Kuiper belt 39 Very Large Array 39 Deimos 39 Enceladus 39 Asteroid 39 Antimatter 39 CMEs 39 Northern Lights 38 ejecta 38 meteor shower 38 mid latitudes 38 Ursa Major 38 Kokopelli 38 meteoroids 38 aurora borealis 38 supernova explosions 38 ionized gas 38 Neutrinos 38 extrasolar planet 38 vortices 38 heliosphere 38 coronal mass ejections 38 La Niña 38 Little Ice Age