Related by context. Frequent words. (Click for all words.) 58 Gamma ray bursts 58 X ray emission 57 spatial dimensions 56 supernova remnants 55 planetary nebulae 55 auroral 54 starbursts 54 astronomical objects 54 nebulae 53 Type Ia supernovae 53 GRBs 53 supernovae 53 Andromeda galaxy 53 elliptical galaxies 53 galaxy clusters 52 spiral galaxies 52 Sunspots 52 magnetic reconnection 52 supernova remnant 52 spacetime 52 planetary nebula 51 galaxies 51 Kuiper belt 51 Saturn moon Enceladus 51 infrared wavelengths 51 rocky planets 51 supernova explosions 51 observable universe 51 globular clusters 51 magnetosphere 51 anisotropy 51 Milky Way galaxy 51 substorms 51 supernovas 51 Orion Nebula 51 nebula 51 magnetar 51 globular cluster 50 filaments 50 distant galaxies 50 quasar 50 solar corona 50 gamma ray bursts 50 lunar poles 50 visible wavelengths 50 ionized gas 50 explosive eruptions 50 haloes 50 Andromeda Galaxy 50 planets 50 Crab Nebula 49 heliosphere 49 vortices 49 accretion disk 49 brown dwarfs 49 supernova explosion 49 redshift 49 optical telescopes 49 solar nebula 49 gravitational lensing 49 unaided eye 49 ecliptic 49 distant galaxy 49 meteoroids 49 Milky Way Galaxy 49 magma chamber 49 cosmic microwave background 49 quanta 49 singularities 49 extrasolar planets 49 quasars 49 XMM Newton 49 magnetic flux 48 habitable planets 48 nuclei 48 gamma rays 48 picoseconds 48 earths 48 interstellar medium 48 Milky Way 48 planets orbiting 48 excitons 48 gamma ray 48 crustal 48 plasmons 48 gamma ray burst 48 dwarf galaxies 48 Betelgeuse 48 bubbles 48 supermassive black hole 48 Saturn moons 48 scarps 48 pulsars 48 heliosheath 47 magnetic fields 47 supernova 47 sunspots 47 Eta Carinae 47 torus 47 Earth magnetosphere 47 CMEs