Related by context. Frequent words. (Click for all words.) 64 active galactic nuclei 62 accretion disk 61 supernova explosion 61 ionized gas 60 planetary nebula 60 magnetars 59 interferometers 59 X ray emission 58 supernova remnants 58 planetary nebulae 58 neutron star 58 Hawking radiation 57 moonlets 57 neutron stars 57 quasars 57 Gamma ray bursts 56 galaxy clusters 56 magnetar 56 Cosmic rays 56 magnetic fields 56 subatomic particle 56 supernova explosions 56 quasar 56 spacetime 55 dwarf galaxy 55 WASP #b 55 Gamma rays 55 Cepheids 55 supernova remnant 55 oscillatory 55 distant galaxy 54 singularities 54 solar corona 54 planetesimals 54 distant galaxies 54 optical microscopy 54 Pulsars 54 gravitational waves 54 Crab Nebula 54 comet tail 54 ionised 54 Type Ia supernovae 54 accreting 54 meteoroids 54 starbursts 53 supernovae 53 nebula 53 X ray Observatory 53 interstellar medium 53 globular cluster 53 Brownian motion 53 gravitational lensing 53 ejecta 53 polar vortex 53 magnetic reconnection 53 Oort Cloud 53 torus 53 gamma rays 53 magnetic flux 53 interferometric 53 pulsar 52 supermassive black holes 52 galaxies 52 visible wavelengths 52 spiral galaxies 52 coronal 52 phonons 52 photonic crystal 52 galaxy formation 52 pulsars 52 Kuiper Belt objects 52 Eta Carinae 52 interferometry 52 Haumea 52 spherical 52 laser pulses 52 Andromeda galaxy 52 subatomic particles 52 GRBs 52 isotropic 52 elliptical galaxies 52 cigar shaped 52 galaxy cluster 52 hot Jupiters 52 toroidal 52 nebulae 52 Orion Nebula 51 pyroclastic flow 51 magnetosphere 51 filaments 51 Milky Way Galaxy 51 excitations 51 atomic nuclei 51 supermassive black hole 51 velocities 51 optical telescopes 51 orbiting planets 51 globular clusters 51 electrically conducting 51 GRB # 51 vortices