Related by context. Frequent words. (Click for all words.) 55 solar nebula 55 active galactic nuclei 54 galaxy clusters 53 galaxy cluster 53 WIMPs 53 Kuiper belt 53 dwarf galaxies 53 galaxy formation 53 planetary nebulae 52 X ray emission 52 Bose Einstein condensate 51 torus 51 ionized gas 51 accretion disk 51 ejecta 50 accreting 50 cosmological constant 50 fermions 50 Type Ia supernovae 49 aerosol particles 49 magnetar 49 planetary nebula 49 supernova explosions 49 galaxies 49 elliptical galaxies 49 gravitationally 49 globular clusters 49 observable universe 49 excitons 49 solar corona 48 ionised 48 HD #b [002] 48 dense 48 unobservable 48 quark gluon plasma 48 dwarf galaxy 48 gravitational lensing 48 rocky planets 48 globular cluster 48 shorter wavelengths 48 Cabeus crater 48 quanta 47 Dark Matter 47 brown dwarfs 47 cosmic microwave background 47 high temperature superconductivity 47 visible wavelengths 47 distant galaxies 47 carbonaceous 47 astrophysical 47 quasar 47 supernova remnant 47 supercluster 46 Enceladus 46 Gliese #g 46 Eta Carinae 46 silicates 46 Saturn rings 46 antiprotons 46 spacetime 46 neutron stars 46 superfluid 46 interstellar medium 46 excitations 46 spherules 46 dynamical 46 nuclei 46 gaseous 46 supersymmetry 46 alpha particles 46 lunar soil 46 magnetic flux 45 supernova remnants 45 methane hydrates 45 Gamma ray bursts 45 quasars 45 haloes 45 silicate 45 GRBs 45 water vapor 45 terrestrial planets 45 regolith 45 Antimatter 45 heliosheath 45 supermassive black holes 45 magnetic fields 45 radiative 45 Earth magnetosphere 45 Astrophysicists 45 planet orbiting 45 muons 45 singularities 45 neutron star 45 interstellar dust 45 redshift 45 gamma rays 45 supermassive black hole 45 anisotropy 44 brown dwarf 44 antimatter 44 densest