Related by context. Frequent words. (Click for all words.) 67 active galactic nuclei 61 accretion disk 60 planetary nebulae 59 magnetar 59 Gamma ray bursts 59 elliptical galaxies 59 colliding galaxies 58 supernova explosion 58 WIMPs 58 dwarf galaxy 58 starbursts 58 neutron stars 58 Hawking radiation 58 supernova remnants 57 X ray emission 57 singularities 57 galaxies 57 planetary nebula 57 supernova explosions 57 galaxy clusters 57 spiral galaxies 57 neutron star 57 Cosmic rays 57 Kuiper belt 56 globular clusters 56 galaxy cluster 56 supermassive black hole 56 excitations 56 distant galaxy 56 Gamma rays 56 spacetime 56 planets 56 globular cluster 56 orbiting planets 56 galaxy 55 magnetic fields 55 supermassive black holes 55 Andromeda galaxy 55 quasars 55 supernovae 55 Earth magnetosphere 55 galaxy formation 55 observable universe 55 quasar 55 interstellar dust 55 nebulae 55 Type Ia supernovae 54 nuclei 54 torus 54 haloes 54 gravitationally 54 habitable zones 54 Milky Way Galaxy 54 solar nebula 54 Milky Way galaxy 54 GRBs 54 astrophysical 54 hot Jupiters 54 auroral 53 quanta 53 subatomic 53 supernova remnant 53 atomic nucleus 53 superfluid 53 bosons 53 electron density 53 ionized gas 53 dwarf galaxies 53 ringed planet 53 brown dwarfs 53 subatomic particle 53 HD #b [002] 53 atomic nuclei 53 radial velocity 53 accreting 53 solar corona 53 shorter wavelengths 52 visible wavelengths 52 gravitational waves 52 vortices 52 Jupiter moons 52 rocky planets 52 distant galaxies 52 habitable planets 52 terahertz radiation 52 phonons 52 muon 52 supernova 52 magnetosphere 52 whorls 52 redshifts 52 excitons 52 quark gluon plasma 52 subatomic particles 52 planet orbits 52 pulsars 52 spiral galaxy 52 magnetic reconnection 51 exciton 51 fluorescing 51 atomic particles