Related by context. Frequent words. (Click for all words.) 60 GRBs 58 distant galaxies 58 Kuiper belt 58 galaxy formation 57 astronomical objects 57 elliptical galaxies 57 galaxies 57 dwarf galaxy 56 distant galaxy 56 infrared wavelengths 56 quasars 55 galaxy clusters 55 brown dwarfs 55 super Earths 55 dwarf galaxies 55 globular clusters 55 nebulae 55 X ray emission 54 Saturn rings 54 neutron stars 54 spiral galaxies 54 gamma ray bursts 54 Milky Way Galaxy 54 HD #b [002] 54 supernova explosions 54 rocky planets 53 constellation Perseus 53 supernova explosion 53 celestial object 53 redshift 53 galaxy cluster 53 supermassive black holes 53 Eta Carinae 53 gravitational waves 53 pulsars 52 planets 52 microlensing 52 Astrophysical Journal Letters 52 terrestrial planets 52 extrasolar planets 52 WIMPs 52 constellation Leo 52 magnetar 52 quark gluon plasma 52 Leonids 52 hot Jupiters 52 Jupiter Saturn Uranus 52 accretion disk 52 globular cluster 52 Andromeda galaxy 52 meteoroids 52 ionized gas 51 substorms 51 unaided eye 51 Andromeda Galaxy 51 Orion Nebula 51 exoplanets 51 brown dwarf 51 Jupiter Saturn 51 Geminids 51 supernova remnant 51 supernovae 50 extrasolar planet 50 neutron star 50 XMM Newton 50 accreting 50 celestial objects 50 ejecta 50 quasar 50 Astrophysical Journal 50 interstellar dust 50 gamma ray burst 50 nuclei 50 cosmic microwave background 49 Milky Way galaxy 49 supernovas 49 Gliese #g 49 comets 49 astronomers 49 heliosphere 49 Crab Nebula 49 outer planets 49 Monthly Notices 49 habitable planets 49 spiral galaxy 49 Perseids 49 Cancri 49 NASA Chandra 49 silicates 49 CMEs 49 exoplanet 49 Saturn moons 49 celestial bodies 49 cosmic rays 49 interstellar medium 49 pulsar 49 nebula 48 supermassive black hole 48 coronal mass ejections 48 gravitational lensing 48 ecliptic