Related by context. Frequent words. (Click for all words.) 61 planetary nebulae 61 Type Ia supernovae 60 X ray emission 59 active galactic nuclei 58 GRBs 58 galaxy formation 57 Hubble observations 57 elliptical galaxies 56 spectroscopic 56 astronomical objects 55 distant galaxies 55 Gamma ray bursts 55 cosmological 55 Jupiter moons 55 globular clusters 55 extrasolar planet 55 globular cluster 55 astrophysical 55 microlensing 55 brown dwarfs 55 WMAP 55 spiral galaxies 55 galaxies 55 supernovae 54 supernova remnants 54 quasars 54 magnetic reconnection 54 accretion disk 54 planets circling 54 dwarf galaxy 54 planet orbits 54 planets 54 galaxy cluster 54 galaxy clusters 54 Kuiper belt 54 HD #b [002] 54 distant galaxy 54 Eta Carinae 53 solar corona 53 planetary nebula 53 shorter wavelengths 53 auroral 53 supernova explosions 53 planet orbiting 53 interferometry 53 magnetar 53 visible wavelengths 53 Mimas 53 habitable zones 53 redshift 53 nebulae 53 rocky planets 53 solar nebula 53 dynamical 53 brown dwarf 52 WIMPs 52 Milky Way Galaxy 52 supernova remnant 52 photometric 52 infrared wavelengths 52 Hawking radiation 52 extrasolar planets 52 interstellar medium 52 starbursts 52 planets orbiting 52 NICMOS 52 interstellar dust 52 spectra 52 supernova explosion 52 Andromeda galaxy 52 supernovas 52 celestial objects 51 neutrino 51 astronomers 51 z = 51 Crab Nebula 51 super Earths 51 Orion Nebula 51 celestial object 51 Galaxy Evolution 51 spectral 51 exoplanet 51 Ultraviolet light 51 gravitational lensing 51 morphologies 51 cosmic ray 51 habitable planets 51 spectral signature 51 terrestrial planets 51 unaided eye 50 interplanetary spacecraft 50 gamma ray bursts 50 substorms 50 accreting 50 WM Keck Observatory 50 astronomical observations 50 XMM Newton 50 COROT 50 constellation 50 supernova 50 dwarf galaxies