Related by context. Frequent words. (Click for all words.) 65 sunspot activity 63 Little Ice Age 60 sunspots 56 sunspot 52 glaciation 51 occultation 50 geomagnetic storm 49 X ray emission 49 geomagnetic 49 supermoon 49 El Ninos 49 Geminids 48 geomagnetic field 48 aurora 48 Medieval Warm Period 48 volcanism 48 Sunspot 47 El Nino 47 minima 47 autumnal equinox 47 solar flares 47 El Niño 46 supernova explosion 46 supernova 46 Orion Nebula 46 auroras 46 La Nina 46 Holocene 46 oscillations 46 gamma ray burst 45 La Niña 45 Leonids 45 greenhouse warming 45 equinox 45 gravitational lensing 44 Perseids 44 Saturn rings 44 XMM Newton 44 meteors 44 northern latitudes 44 Eta Carinae 44 GRBs 44 oscillation 44 North Atlantic Oscillation 44 coronal mass ejection 44 meteor shower 44 albedo 44 equatorial Pacific 44 ENSO 44 supernovas 43 ringed planet 43 mass extinctions 43 winter solstice 43 atmospheric circulation 43 Northern Hemisphere 43 El Nino phenomenon 43 nebula 43 summer solstice 43 radioactive decay 43 brown dwarfs 43 Pliocene 42 temperate regions 42 spring equinox 42 ionosphere 42 CO2 concentrations 42 supernova explosions 42 corona 42 aridity 42 supernovae 42 solstice 42 vernal equinox 42 HD #b [002] 42 cosmic ray 42 quasar 42 desiccation 42 supernova remnant 41 gamma ray bursts 41 perigee 41 Seasonal Affective Disorder 41 redshift 41 glacial melt 41 luminosity 41 perturbation 41 quasars 41 cosmological constant 41 super Earths 41 comets 41 Solar System 41 cosmologists 41 mid latitudes 41 volcanic activity 41 heliosphere 41 atmospheric concentrations 41 cosmic rays 41 latitudes 41 atmospheric CO2 40 Iapetus 40 Betelgeuse 40 Perseid meteor shower 40 cosmic microwave background 40 pulsars