Related by context. Frequent words. (Click for all words.) 52 astrophysical 51 CMEs 50 solar flares 50 magnetosphere 47 supernova explosion 47 quasars 47 dynamical 47 convective 46 gamma rays 46 geomagnetic field 46 galaxy clusters 46 quasar 45 neutron stars 45 supernovae 45 neutron star 44 sunspots 44 cosmic ray 44 cosmic rays 44 corona 44 brown dwarfs 44 astronomers 43 elliptical galaxies 43 supernovas 43 pulsars 43 galaxies 43 nebulae 43 spiral galaxies 43 magnetic fields 43 XMM Newton 42 ionosphere 42 gamma ray bursts 42 comets 42 gravitational waves 42 spacetime 42 globular clusters 42 unaided eye 42 Saturn moons 42 meteor showers 42 geomagnetic 42 interstellar dust 41 planets 41 infrared wavelengths 41 Perseids 41 distant galaxies 41 Solar System 41 Milky Way Galaxy 41 orbits 41 dwarf galaxies 41 Saturn rings 40 heliosphere 40 galaxy cluster 40 supermassive black holes 40 auroras 40 terrestrial planets 39 brown dwarf 39 dust devils 39 extrasolar planets 39 supernova 39 sunspot 39 Astronomers 38 gamma ray burst 38 celestial objects 38 celestial bodies 38 gamma ray 38 outer planets 38 astrophysicists 38 nebula 38 planet orbiting 38 meteors 38 comet 38 crustal 38 abundances 38 vortices 38 oscillations 37 distant galaxy 37 cosmic microwave background 37 HD #b [002] 37 perturbations 37 Milky Way 37 asteroids 37 supermassive black hole 37 cosmological 37 redshift 37 precession 37 Milky Way galaxy 37 telescopes 36 UV radiation 36 volcanic activity 36 Uranus 36 lava flows 36 equatorial 36 volcanic eruptions 36 Enceladus 36 observable 36 ringed planet 36 mid latitudes 35 meteor shower 35 ultraviolet radiation 35 observatories 35 Martian atmosphere 35 aurora